Classification of motor oils API. Motor Oil Classifications Engine Oil SJ

This post fully decided to devote API CF. (API CF-2, API CF-4). What interesting in the CF API? What unites the CF-2 API and the CF-4 API under the flag of the API CF, and what is the difference between them? Let's start, perhaps, with the fact that the CF API is a class. motor oils In the API classification, finally enacted in 1994 (the CF-4 API class was implemented and acted against engines issued in 1990, and the CF-2 API was established only in 1994).

Class API CF. - These are motor oils for diesel engines With divided injection using high sulfur fuel (more than 0.5%). The ratio of engine oil to the CF API class implies additives that are more efficient (compared to outdated and canceled API CD) prevent deposits and tarts on pistons and piston groupand provide increased protection of sliding bearings containing copper.

API CF-2

The feature of the CF-2 API is that this class refers to two-stroke (2 - in the abbreviation) diesel engines operating in heavy conditions operation. The CF-2 API class oil provides enhanced piston rings and the entire group from sediments and nagar ("lumbering" of rings, etc.), contain "reinforced" coking additives and sludge in a diesel engine.

CF-4 API

As for the CF-4 API, this class, which came into effect since 1990, combined motor oils for high-speed and powerful four-strokes (it says 4 in the Abbreviation API CF-4) diesel engines operating in different conditions operation. Ideally, these are powerful trunk tractors, "charged to the endless race" on the highway. With a turbocharged, so without it. Moreover, the additives used in the CF-4 API oils provide increased protection of the piston group from nagar and overheating, even on the forced engines (it was the privilege of the API class CE, but the CF-4 API has successfully replaced it). Another feature of the API CF-4. Oils of this class often correspond to API SJ (i.e. gasoline) class. In this case, it is necessary to coordinate the use of such oil in a gasoline engine with a manufacturer.

Feature API CF.

Forgot to note the feature of the API CF. The fact is that the CF API is the most "ancient" of the current API classes. But "Loading" does not detract from his merits. The presence of the CF API on the market today only emphasizes its specificity. Motor oils of the class API CF will provide the best protection of the piston group from Nagara when using high-teridate fuel, as well as copper-containing bearing protection against wear and corrosion. Oils, certified API CF, provide oil pumpability, both in the usual way and with a compressor or supercharger.

API classification - for gasoline engines, diesel engines, transmission oils and two-stroke engines.
Motor classification system oil api. It has been developed since 1969 as a result of the collaboration of API, ASTM and SAE. A new high-quality step in the development of quality and classification of motor oils was made in 1983-1992, when the "Licensing and certification system of motor oils of the ELCS" was created under the direction of the API (Engine Oil Licensing and Certification System, API Publication NO 1509). All oils that have received licensed are included in the ELCS list, which is published on the Internet.

According to the API system (ASTM D 4485, SAE J183 APR96), three operational categories (three rows) of the appointment and quality of motor oils are installed:

S (Service) - consists of categories of quality engine oils for gasoline engines going in chronological order. For each new oil generation, an additional letter is assigned alphabetically:
API SA, SB, SC, SD, SE, SF, SG, SH, SJ, SL, SM, SN
(Category Si - intentionally missed API, to eliminate confusion with an international system of measures, for the PS-06 project planned the name SK, but one of the engine oil suppliers in Korea uses the abbreviation of SK as part of its corporate name. To eliminate the possible confusion of the letter "K" was replaced by the following "L").

C (Commercial) - It consists of categories of quality and destination of oils for diesel engines going in chronological order. For each new generation An additional letter is assigned alphabetically:
API CA, CB, CC, CD, CE, CF, CF-2, CF-4, CG-4, CF-4, CI-4, CJ-4.

EC (Energy Conserving) - Energy-saving oils - new row high-quality oilsconsisting of low-grade oils that reduce fuel consumption based on test results on gasoline engines.
Motor oils that differ in low viscosity both at low and at high temperatures can be certified for compliance with the category API EC Energy Saving Oil ("Energy Conserving" OIL).
Universal oils for gasoline and diesel engines are denoted by two symbols of the corresponding categories: the first character is the main one, and the second indicates the possibility of using this oil for the engine of another type. For example, API CG-4 / SH is an oil optimized for use in diesel engines, but it can be used in gasoline engines for which the API SH category oil is prescribed and below (SG, SF, SE, etc.).

API - for gasoline engines

API - for diesel engines

API - for two-stroke engines

API - for transmission oils

, Motor tests were held on the latest method of Sequence Engine Test IX and one of the first in the world and the first in Europe was obtained by the licenses of the American Institute of Oil API SN Plus. Ravenol in the next demonstrates leadership in the technologies and production of innovative high-quality motor oils!

Information about the SN Plus API Specification Information

The American Oil Institute (API) has entered into force on May 1, 2018 a new SN Plus API specification. Before entering new API SP and ILSAC GF-6 specifications, at the request of automakers, an intermediate specification of the API SN Plus was introduced. The main differences from the SN API are shown in the graph.

Why was the new specification required?

One of the world's largest automakers, the American Corporation GM, August 31, 2018, introduced a new quality standard for DEXOS 1 GEN engine oils 2. To obtain this new license, motor oils are tested on a turbocharged engine GM 2.0L Ecotec, which is known in Europe like A20NFT or A20NHT. It is installed on a large number of cars, including popular in Europe Opel Insignia., Astra J, Astra k, Saab 9-5, 9-3, as well as on models for the American market Buick Regal, Verano, Cadillac SLS.

But the automotive industry requires secured industry standards. Therefore, it was decided to make a motor test matrix for API SN to make another additional test on the LSPI phenomenon. This test was named Sequence IX and is carried out according to Ford methods on the turbocharged two-liter motor EcoBoost installed on Ford Explorer. (American engine encoding BB5Z-6006-A, in Europe it is known as T20HDTX). According to the requirements of the API SN Plus, up to 5 cases of LSPI when testing Sequence IX. Motor oils Ravenol DXG 5W-30 and Ravenol DFE 0W-20 both when tested on GM engines and on engines Ford., The number of cases of LSPI is reduced to zero. Comparison On the SN API and API SN Plus standards graph shows that the basic requirements remained the same, with the exception of an additional test for premature ignition of the mixture in the cylinder (SEQ IX).

What is LSPI?

Low Speed \u200b\u200bPre Ignition (LSPI) is premature ignition of the mixture in the cylinder. It occurs in turbo engines with direct injection type GDI. The air mixture is flammable too early, forming overpressure in the cylinders. In most cases, LSPI is manifested by "engine noise" and can lead to serious damage, because During LSPI pistons and rods rise up, they are especially subject to failure. In the most extreme case, piston rings are damaged or broken, rugs rush and the spark plugs are damaged.

What are Ravenol products licensed by the SN Plus API?

To date, two Ravenol products are licensed on the SN Plus API:

Product Information

Ravenol DFE SAE 0W-20

Art. 1111109-004

Ravenol DFE SAE 0W-20 - Fully synthetic engine oil based on polyalphaolefins, manufactured using CleanSynto® technology for gasoline engines with and without turbocharging. Provides purity of turbocharger. Ravenol DFE 0W-20 reduces friction, reduces wear and fuel consumption. Extrable replacement intervals according to automakers.

Ravenol DFE SAE 0W-20 prevents LSPI (premature flammings of the mixture in the cylinder) in the engines with direct fuel injection (GDI), which helps to avoid engine damage. Provides excellent characteristics and optimal lubricant properties with a "cold" start. Due to the significant reduction in fuel consumption, Ravenol DFE 0W-20 contributes to environmental protection by reducing harmful emissions into it.

Ravenol DFE 0W-20 has a GM DEXOS1 ™ Gen 2 official license, which is required for gasoline opel engines, General Motors, Chevrolet, Daewoo and Holden.

Specifications:

Licenses:

API SN Plus, SN (RC), ILSAC GF-5

Official tolerance:

GM Dexos1 ™ Gen 2 NR License. D10689HJ081.

Ford WSS-M2C947-A

Ravenol DXG 5W-30

Art. 1111124-005

Ravenol DXG 5W-30 is a completely synthetic engine oil based on polyalphaolefins (PJSC), manufactured using CleanSynto® technology for gasoline engines with and without turbocharging, for example, GDI engines with direct (immediate) fuel injection.

Due to the unique recipe with a combination of high and low viscosity PJSC, Ravenol did not largely used the viscosity index modifiers (VI IMPROVER). Star polymers are used as viscosity modifiers in this formulation. Viscosity modifiers improve the lubricating oil properties with increasing temperatures, thereby allowing the use of oil in a wide range of operating temperatures. Polymer viscosity modifiers are effective in oils operated at moderate loads, in the absence of high shift deformation. With high load and high shear speed, long thickener molecules can break into small fragments, as a result of which the effectiveness of the thickener during operation gradually decreases.

In the recipe as an agents minimizing engine wear, truder-core molybdenum and organic friction modifiers (OFM) were introduced. As well as used high-solar basic oil The fifth group, which has good compatibility with the PJSC used. Ravenol DXG SAE 5W-30 reduces friction, wear and fuel consumption, and also provides excellent characteristics at a cold start. A durable oil film is ensured even at very high operating temperatures, which protects against corrosion, as well as from evaporation of oil (oxidation) or coking.

Due to the significant decrease in the fuel consumption of Ravenol DXG SAE 5W-30 promotes environmental protection by reducing harmful emissions into it. Also, the product prevents LSPI (premature ignition of the mixture in the cylinder), which helps to avoid damage to the engine.

Specifications:

API SN Plus, SN (RC), ILSAC GF-5

Licenses:

API SN Plus, SN (RC), ILSAC GF-5

Official tolerance:

GM Dexos1 ™ Gen 2 License No. D10709HK081

Ford WSS-M2C946-A, Ford WSS-M2C929-A, Chrysler MS-6395, Honda / Acura HTO-06

Obtaining an official license API SN Plus allows you to apply Ravenol DXG SAE 5W-30 and Ravenol DXG SAE 5W-30 and Ravenol DFE 0W-20 in a warranty and post-warranty period in all engines requiring quality level lubricants SN API Including turbine gasoline engines with direct fuel injection, such as: Ford / Jaguar / Land Rover / Volvo EcoBoost, GM / Opel / Chevrolet Ecotec, Mazda SkyActiv, Nissan Dig-T, Renault Tce, Mitsubishi / Hyundai T-Gdi, Toyota 8ar -FTS / 8NR-FTS, Honda Vtec-Turbo and others.

Please note that Ravenol DXG SAE 5W-30 and Ravenol DFE 0W-20 motor oils with DEXOS 1 GEN 2 tolerance are available on russian market From August 2017. Now these oils have received an official license API SN Plus. At the same time, the oil recipe did not change. This suggests that Ravenol technology is ahead of existing industry standards. Now on sale there are canisters with labels, on which the SN API license is still indicated, but on the fact it has long been the API SN Plus. Simply until 01.05.2018 Hompp The American Institute of Oil did not issue a license API SN and the oil producers did not have the right to specify the SN Plus API on the labels. Actual license information can always be checked on the official API website in the https://engineoil.api.org/directory/eolcsResults?AccountId\u003d-1&brandname\u003dravenol

Under the Abbreviation API, it is necessary to understand the classification of the API motor fluids, thanks to the specified system developed by the American Institute of Oil, it is possible to choose the mixture depending on the type of fuel used for the car and the release of the motor, taking into account its technical characteristics.

According to the standards of the specified system, motor fluids are divided into three classes:

• S (Service) includes mixtures for motors operating on gasoline;
• C (commercial), accommodates dT-operating fluids;
• EC (Energy Conserving) includes low-viscosity energy-saving fluids, easy to accurate, reduce fuel consumption.

The marking of each class of the car consists of two letters of the Latin alphabet. The first indicates the type of fuel applicable to the car, the second indicates the qualitative characteristics of the motor mixture, the farther alphabetically there is a second letter, the better the properties have oil. For Motors working on DT, classes are additionally divided into four-stroke and two-stroke motors, subclasses accordingly are marked with Arabic numbers 4 and 2.

For universal cars (diesel and gasoline), double marking is used, for example, SF / CC, for what fuel is more suitable oil indicates the first letter of the designation.

According to the API standard, there are classes excluded from the classification, but machines with old engines continue to need these classes, therefore, according to the specified system, the class, which is an order of magnitude higher, replaces the downstream.

In addition to the requirements for viscosity and the tribological properties of mixtures, their effect on the exhaust gas purification system is taken into account, interaction with the particulate filters. Categories of liquids with a reduced amount of sulfate ash, phosphorus and sulfur are used for motor-neutralizers, the particulate filtering elements.

You can find out detail about the API specification by reviewing the video:

Classes for gasoline engines

Table 1 shows the classification of motor mixtures with marking S.

Table 1. Automotive for gasoline drives.

Specification for diesel drives

Table 2, indicates the specification of motor fluids by API with marking C.

Table 2. Automotive for drives operating on diesel.

Marking on canister

Automal, the composition of which was subject to laboratory research and meets the standards of API and SAE, are marked with a graphic round mark, which indicates the viscosity of the motor mixture and the quality category corresponding to the classification of motor fluids by API.

Such a designation is applied only for energy-saving fluids, the highest quality. For example, the sign shown in Figure 1 indicates: All-season liquid. Can be applied in temperature range -30 0 s to +25 0 s. In this case, will provide cold launch The motor without heating and pumping the mixture on the lubricant system, plus prevents the motor overheating at a high plus temperature over the side of the car. On these characteristics of the all-season mixture indicates the inscription SAE 5W-30. From the inscription API SERVICE SN follows: engine oil is designed for the latest gasoline engines. It can be used for actuators working on biofuel, they provide maximum protection of ecology, continuous engine resource. The inscription at the bottom of the sign indicates the energy-saving properties of the mixture and the increased replacement period.

Choosing motor fluid It is necessary to take into account the recommendations of the car dealer, as the oil is too thick or strongly liquid will not be able to protect the motor from wear: lead to dry friction of parts, and this is a direct path to the overhaul of the power unit.

For Japanese car engines, the ILSAC system is used, together with the API, such fluids have a small flow rate, contain the minimum amount of phosphorus and sulfur. They can be used in motors equipped with filter elements of exhaust gases.

The classification system of the API motor oils () was created in 1969. According to the API system, three operational categories (three rows) of the destination and quality of motor oils are installed:
S (Service) - consists of categories of quality engine oils for gasoline engines going in chronological order.
C (Commercial) - It consists of categories of quality and destination of oils for diesel engines going in chronological order.
EC (Energy Conserving) - Energy-saving oils. New Series High-quality oils consisting of low-viscosity, lightweight oils that reduce fuel consumption according to the results of tests on gasoline engines.

For each new class, an additional letter is assigned alphabetically. Universal oils for gasoline and diesel engines are denoted by two symbols of the corresponding categories: the first character is the main one, and the second indicates the possibility of using this oil for the engine of another type. Example: API SM / CF.

API quality classes for gasoline engines

API class SN. - approved on October 1, 2010.
The main difference between the SN API from previous API classifications in limiting phosphorus content for compatibility with modern system neutralization systems, as well as integrated energy saving. That is, the oils classified according to the API SN will approximately correspond to ASE C2, C3, C4, without an amendment to high-temperature viscosity.

API class SM. - Approved on November 30, 2004.
Motor oils for modern gasoline (multi-chamber, turbocharged) engines. Compared to the SL class, motor oils that meet the requirements of the API SM should have higher levels of oxidation and premature wear Engine parts. In addition, the standards are raised relative to the properties of the oil at low temperatures. Engine oils of this class can be certified by ILSAC Energy Saving Class
Motor oils that meet the requirements of the SL API, SM can be applied in cases where the car manufacturer is recommended class SJ or earlier.

API class SL. - Motor oils for engines of machines released after 2000.
In accordance with the requirements of car manufacturers, the automal of this class is used in multi-chamber, turbocharged motors working on fuel mixtures that meet modern enhanced ecology requirements, as well as energy saving. Automoles that meet the requirements of the SL API can be used in cases where the SJ class is recommended for automakers or earlier.

API class SJ. - Motor oils for use in gasoline engines since 1996 release.
This class describes the car used in gasoline engines, starting from 1996 release. Motor oils of this class are designed for use in gasoline engines of passenger and sports cars, minibuses and light trucks that are serviced in accordance with the requirements of car manufacturers. SJ provides for the same minimum standards as sh as well additional requirements to nagara formation and working at low temperatures. Motor oils that meet the requirements of the API SJ can be used in cases where the car manufacturer is recommended class SH or earlier.

API class sh- Motor oils for gasoline engines starting from 1994 release.
The class was adopted in 1992 for motor oils recommended since 1993. This class is characterized by higher requirements compared to the SG class, and has been developed as a substitute for the latter, to improve anti-carbon, anti-substitution, antisository properties of oils and increased corrosion protection. Motor oils of this class are designed for use in gasoline engines. passenger cars, minibuses and lungs trucks, in accordance with the recommendations of their manufacturers. Motor oils of this class were tested in accordance with the requirements of the Association of Chemical Products (SM). Motor oils of this class can be used in cases where the car manufacturer is recommended by the SG class or earlier.

API class SG.- Motor oils for gasoline engines Starting from 1989 release.
Designed for use in gasoline engines of passenger cars, minibuses and light trucks. The engine oils of this class have properties that provide improved protection against carpets, oxidation of the machine and motor wear, in comparison with previous classes, and also contain additives that protect against rust and corrosion of internal parts of the engine. Engine oils of class SG comply with the requirements for motor oils for diesel engines API CC and can be used where SF, SF / CC classes or SE / CC are recommended.

API class SF.- Motor oils for gasoline engines Starting from 1980 release (outdated class).
These engine oils were used in gasoline engines of 1980-1989 issues, subject to the availability and instructions of the engine manufacturer. Provide enhanced oxidation resistance, improved wear protection, in comparison basic characteristics Machines SE, as well as more reliable protection From nagar, rust and corrosion. Engine oils of class SF could be applied as replaceable SE, SD or SC classes.

Class API SE - Motor oils of gasoline engines of release since 1972 (outdated class). These engine oils were used in gasoline motors of the 1972-79 models, as well as some models of 1971. Additional protection in comparison with SC and SD machines and can be used as substitutes for these categories.

API class SD. - Motor oils for use in gasoline engines since 1968 (outdated class). The automotive of this class was used in gasoline engines of passenger cars and some freight release of 1968-70, as well as some models of 1971 and later. Improved protection compared to SC motor oils, also applied exclusively with the recommendation of the engine manufacturer.

Class API SC. - Motor oils for gasoline engines, starting from 1964 release (outdated class). Usually used in engines of passenger cars and some trucks of 1964-1967. Reduce high and low-temperature nagar, wear, and also protect against corrosion.

API class SB. - Motor oils for low-power gasoline engines (outdated class). Motor oils of the 30s of the 20th century, which provided enough easy protection against wear and oxidation, as well as anti-corrosion protection of bearings in motors that are operated in light load modes. Motor oils of this class can only be used if they are specifically recommended by the engine manufacturer.

API Class SA. - Motor oils for gasoline and diesel engines. Outdated class of oils for use in old motors operating in such conditions and modes in which the protection of parts is not needed. Motor oils of this class can only be used if they are recommended by the engine manufacturer.

Quality Class APIs for diesel engines

Class API CJ-4- Specifies from October 1, 2006.
This class is designed specifically for heavy engines. Responsible to key requirements for NOX emission standards and solid particles for the manufacture of 2007. The CJ-4 oils introduce limits by some indicators: asilism is less than 1.0%, sulfur 0.4%, phosphorus 0.12%.
The new classification accommodates the requirements of earlier categories of the API CI-4 Plus, CI-4, but carries significant changes in the demand for the needs of new engines that respond new environmental standards 2007 and later models.

Class API CI-4 (CI-4 Plus) - New operating class of motor oils for diesel engines. Compared to API CI-4, the requirements for the specific content of soot, as well as evaporates and high-temperature oxidation are increased. When certified in this classification, motor oil must be tested in seventeen motor tests.

Class API CI-4 - Class introduced in 2002.
These engine oils are used in modern diesel engines with various species Injection and supervision. The engine oil corresponding to this class must contain appropriate wash-dispersing additives and has, in comparison with the CH-4 class, increased thermal oxidation resistance, as well as higher dispersing properties. In addition, such cars provide a significant reduction in motor oil foam due to a decrease in volatility and reducing evaporation at operating temperature up to 370 ° C, under the influence of gases. The requirements for cold rockers are also strengthened, the resource of gaps, tolerances and motor seals increased by improving car fluidity.
The CI-4 API class is introduced in connection with the emergence of new, more stringent requirements for the ecology and toxicity of exhaust gases, which are presented to engines issued from October 1, 2002.

Class API CH-4 - Specifies from December 1, 1998.
Engine oils of this class are used in four-stroke diesel engines, which are operated in high-speed modes and comply with the requirements of the norms and standards for the toxicity of exhaust gases adopted in 1998.
The API CH-4 car corresponds to the sufficiently strict requirements of both American and European manufacturers of diesel engines. Class requirements are specifically designed for use in engines operating on high-quality fuel with a specific sulfur content of up to 0.5%. At the same time, in contrast to the class API CG-4, the resource of these engine oils is less sensitive to the use of diesel fuel with a sulfur content of more than 0.5%, which is especially relevant for South America, Asia, Africa.
Motor oils API CH-4 comply with increased requirements and should contain additives, more efficiently prevent valve wear and water treatment on internal surfaces. Can be used as substitutes for motor oils of the API CD, API CE, API CF-4 and API CG-4 in accordance with the recommendations of the engine manufacturer.

CG-4 API Class- The class was presented in 1995.
Motor oils of this class are recommended for four-stroke diesel engines of buses, trucks and tractors of the main and non-maternal type, which are operated in the modes of increased loads, as well as high-speed modes. Motor oil API CG-4 is suitable for engines that use high-quality fuels with a specific sulfur content of not more than 0.05%, as well as in motors for which special requirements for fuel quality are not put forward (the specific sulfur content can reach 0.5% ).
API CG-4 Class Machines must more effectively prevent wear of internal parts of the engine, formation of a car on internal surfaces and pistons, oxidation, foaming, soot formation (these properties are especially needed for modern engines main buses and tractor).
The CG-4 API class has been created in connection with the approval of new requirements and standards for the ecology and toxicity of exhaust gases (edition of 1994). Engine oils of this class can be used in engines for which the CD, API CE and API CF-4 APIs are recommended. The main disadvantage limiting the massive use of this class, for example, in Eastern Europe and Asia, this is the essential dependence of the resource of the car from the quality of the fuel used.

Class API CF-2 (CF-II) - Automal, intended for use in two-stroke diesel engines, which are operated in difficult conditions.
Class introduced in 1994. Motor oils of this class are commonly used in two-stroke diesel engines that operate in high loading conditions. The CF-2 API oils must contain additives that provide the protection of increased efficiency from wear of the internal parts of the engine, such as cylinders and rings. In addition, these cars must prevent deposit accumulation on the inner surfaces of the motor (improved cleaning function).
The CF-2 engineer certified by the CF-2 class has improved properties and can be used instead of earlier similar oils provided that the manufacturer's recommendation is provided.

CF-4 API Class - Motor oils for use in four-stroke diesel engines, starting from 1990 release.
Engine oils of this class can be used in four-stroke diesel engines, the operating conditions of which are associated with high-speed modes. For such conditions, the requirements for the quality of oils exceed the possibilities of the CE class, so the CF-4 motor oils can be used instead of the CE class oils (if there are appropriate engine manufacturer's recommendations).
API CF-4 API must contain appropriate additives that provide a reduction in car utaway, as well as to protect against Nagara in the piston group. The main purpose of the motor oils of this class is to use in diesel engines of heavy-duty tractors and other cars that are used for long-distance travels in highways.
In addition, such engine oils are sometimes assigned a dual class API CF-4 / S. In this case, if you have the relevant recommendations of the engine manufacturer, these cars can also be used in gasoline engines.

Class API CF (CF-2, CF-4) - Motor oils for diesel engines with indirect injection. Classes have been introduced since 1990 and to 1994. The digit through a hyphen means a two-or four-stroke engine.
The CF class describes the motor oils recommended for use in diesel engines with indirect injection, as well as other types of diesel engines that operate on fuel of various quality, including with an increased sulfur content (for example, more than 0.5% of the total mass).
Motor oils certified by the CF class contain additives that contribute to more efficient prevention of deposits on piston, wear and corrosion of copper (with copper content) of bearings, which is of great importance for these types of engines, and can be pumped in the usual way, as well as using a turbocharger or compressor. Motor oils of this class can be used where the CD quality class is recommended.

Class API CE - Motor oils for use in diesel engines, starting from 1983 release (outdated class).
The automal of this class was intended for use in some heavy-duty turbocharged engines characterized by a significantly increased working compression. The use of such oils was allowed for engines both with low and high rates of the shaft.
The engine oils of the CE API were recommended for low-and high-rustic diesel engines released, starting since 1983, which were operated in high-load modes. Subject to the availability of the relevant recommendations of the manufacturer of the engine, these cars could also be used in motors for which motor oils of class CD were recommended.

CD-II API class - Motor oils for use in heavy duty diesel engines with a two-stroke rpabamy cycle (outdated class).
The class was introduced in 1985 for use in two-stroke diesel engines and is essentially the evolutionary development of the previous class API CD. The main purpose of using such cars was to use in heavy powerful diesel engines, which were installed mainly on agricultural equipment. The engine oils of this class comply with all the working standards of the previous CD class, in addition, the requirements are significantly increased with respect to the high efficiency engine protection from carbon and wear.

API CD class - Engine oils for diesel engines of high power, which were used in agricultural machinery (outdated class). The class was introduced in 1955 for normal use in some diesel engines, both atmospheric and turbocharged, with increased compression in cylinders, where it is extremely important effective protection from Nagara and wear. The engine oils of this class could be used in cases where the engine manufacturer did not put forward additional requirements for fuel quality (including fuel with an increased sulfur content).
The API CDs were required, compared with previous classes, ensure increased protection against corrosion of bearings and high-temperature carpets in diesel engines. Often, motor oils of this class called "Caterpillar Series 3", due to the fact that they comply with the requirements of Superior Lubricants (Series 3) certification, developed by the tractor company Caterpillar.

Class API SS - Motor oils for diesel engines, which are operated in the average load modes (outdated class).
The class was introduced in 1961 for use in some motors, both atmospheric and turbocharged, which were characterized by increased compression. Engine oils of this class were recommended for engines that were operated in moderate and high load modes.
In addition, provided that the manufacturer's recommendations are guided, such cars could be used in some powerful gasoline engines.
Compared to earlier classes, Motor oils API SS were to provide more high level protection against high-temperature nagar and corrosion of bearings in diesel engines, as well as from rusting, corrosion and low-temperature Nagar in gasoline engines.

API class St. - Engine oils for diesel engines working with an average load (outdated class).
The class is approved in 1949, as an evolutionary development of class CA when using fuel with an increased sulfur content without special quality requirements. The API API was also intended for use in supervisory motors, which were operated in lightweight and moderate modes. Often, this class was called "Motor oils" Appendix 1 ", thereby emphasizing the compliance with the MIL-L-2104A military prescription application 1.

API Class Sa. - Motor oils for low-loaded diesel engines (outdated class).
The automal of this class is intended for use in diesel engines working in light and moderate modes on high-quality diesel fuel. In accordance with the recommendations of car manufacturers, they can also be used in some gasoline engines that are operated in moderate modes.
The class was widely used in the 40s and 50s of the last century and cannot be used in modern conditions, if this is not provided for by the requirements of the engine manufacturer.
Motor oils API CA must have properties that provide protection from Nagara to piston rings, as well as from corrosion of bearings in reducing motor, for which special requirements for fuel quality are not provided.