Subaru Forester. 2.5XT / Subaru Forester, 5DV SUV, 230 hp, 5mcpp, 2008 - 2011 - high oil consumption in the engine

Subaru Forester 2.5XT 5DV. SUV, 230 LS, 5MCPP, 2008 - 2011 G.V. - Large oil consumption in the engine

Increased oil consumption in the engine

The reasons great expense Oil

In the engine of any vehicle Lubricants are somehow spending without a residue. It is explained by this inevitable getting of these funds into the combustion chamber from the walls of cylinders, with crankcase gases or on the valve rods. Oil consumption depends on the features of the vehicle design.

Oil flow rate
In traditional engines, the consumption level should be from 0.1 to 0.3% of the total fuel consumption. If fuel consumption is 10 liters, then the optimal level of lubricating consumption will be 10-30 grams of oil per 100 km of way. Thus, it is quite acceptable if the flow rate does not exceed 3 liters by 10 thousand kilometers of the way.

For forced turbines, especially with several turbines, the permissible level of oil consumption will be from 0.8 to 3% of the fuel consumption. Such an oil consumption depends on the revolutions on which the engine runs the main time. The more turns are performed, the greater the fuel consumption and oil is observed. Each owner of the car can independently determine what is increased flow Oils for their car.

Incorrectly selected engine oil viscosity and internal leaks as causes of oil fuse.

Often, the presence of an increased oily consumption may be due to the following reasons:

Outdoor leakage, under which the leaks are meant through the glands and gaskets;
Internal oil leakage, which is called avgar.
Leakage of any kind must be eliminated as quickly as possible, as this is a matter of operation of operation.

Outdoor leaks. What are they and what to do to detect them?

The outer leakage is usually easily determined by drops of oil under the vehicle.

Sources of outdoor leakage:

Gasket under the valve lid. This species Lech is one of the most common. The upper part of the engine is one of the most preheated parts, while the gasket materials are growing pretty quickly. In addition, the valve mechanism is often subjected to disassembly during repair work. Removal and reverse installation of the valve cover extremely negatively affects the durability of the gaskets. The gasket under the head block flows quite rarely.
Laying the pallet. It rarely flows, usually due to the weakening of fasteners and aging gasket, but this type of leak is one of the most difficult to eliminate, since the engine itself is necessary on some cars to remove the pallet.
Laying front cover. Rare Type of leaks, but also unpleasant due to the grinding in the engine compartment modern models machines. This fact causes certain difficulties when replacing the gasket.
Selns. The leakage can also occur through the glands: front and rear crankshafts, camshaft seal. The glands begin to skip the oil from their natural wear. If the car mileage exceeds 150,000 km, then the glands should be given special attention. Front gland can throw oil drive belt Gas distribution mechanism. Rear gland leads to gripping clutch. Both are unacceptable. In the event of a leakage at the place of the engine joint and gearbox, the question arises, from where the leakage specifically, the leakage is going on such a huge number of problems. It is quite simple to determine this: it is necessary to take a drop of leaked oil and apply to the surface of the water. If the drop is spread with iris film on the surface, then the leakage of the gearbox.
Oil filter seal. The cartridge type filter gasket can be pierced, especially when the motor is started at low temperatures. The reasons may be two: either poor filter quality, or a malfunction of the bypass valve of the oil line.

Also there is one rarely encountered case - simultaneous small leakage of all seals and engine connections. This often lies the reason why the engine literally "sweats", which is why oil flows in huge quantities.

In this case, the leakage is not associated with the quality of seals. It says too high pressure Carter gases. The reason for this pressure lies in the state of the internal parts of the engine. The increased pressure of crankcase gases on active smoke from the crankcase ventilation tube is determined. This problem is eliminated by cleaning the crankcase ventilation system or, in running cases - overhaul damaged engines.

It is believed that too liquid or too thick oil level leads to the fact that the oil film generated by the oil-chain ring will be too thin or too thick.

Too thin film poorly seals the combustion chamber, causing a breakthrough of oil droplets along with crankcase gases into the combustion chamber. The oil is burning - from here and an unjustified level of consumption occurs. Too strong viscosity leads to the "float" of the piston rings and also contributes to too high level Flow. Reducing the viscosity of motor oil fuel system; At the same time, the fuel enters the oil along the cylinder walls, and the resulting mixture is actively burning, causing consumption more than the desired one.

Inner leak due to masonry Caps

The most common types of internal oil leaks in the engine are leaks through valve glands, that is, the oil-challenge caps.

The oil slimming caps from time and temperature lose elasticity, harden, wear out and crack.

Worn valve sleeves allow valves to swing and additionally split valve seals. Oil, overcoming the weak resistance of the gland, flows on the valve down and enters the combustion chamber. You can diagnose the problem by powerful smoking when the engine is started - on a heated engine and when the smoke is weaker.

Also a sign of wear of the oil-challenge caps is the gross thread of spark plugs.

Consider such a cause of leakage as an inner leak due to compression and oil-giving rings. Leaks through rings are associated with their wear, or mobility loss (crooking), or due to wear / destruction of the grooves of piston rings, or zadira on the walls of the cylinders.
The avgar through the rings is accompanied by a smoking in the engine. From the exhaust pipe goes blue or sIZY smoke with a characteristic smell. Especially it becomes noticeable under load when typing or resetting the gas. On cars with sample catalysts of the current generation smoke can be minority, as the catalyst has time to shove the remains of oils.

What will happen if the excessive oil consumption is not eliminated?
In some cases, consumption coming beyond the normalized engine is lack of lubricant material, which can be one of the reasons for the strongest pollution of the oil system that can provoke a large oil consumption and significantly apply your car. Loss of lubricant leads to a drop in oil pressure, accelerated wear, sharp reduction in resource and engine output. Restoration or replacement of the engine are very expensive, so excessive consumption of lubricants must be eliminated on the earlier stage of the problem, if you do not want to go broke on new engine.

Why the elimination of an increased flow problem is extremely important?

It should be immediately said that with high wear of the engine and the large leakage of the lubricant, you will need to repair the engine. But very often, especially when the problem only began to manifest itself, there are simpler, and most importantly, inexpensive ways to solve problems, due to which oil is incorrectly consumed.

Specifications

Technical characteristics Subaru. Forester 2.5XT / Subaru Forester in the body 5 DV. SUV with a 230 hp engine, 5mcps, produced from 2008 to 2011

In the new models Audi, BMW and Subaru have to pour oil.

Many automakers declare that the engine oil into the engine on new cars is a normal phenomenon. Let some models of cars, according to manufacturers, whining of motor oil between replacements is a normal phenomenon, but, according to Consumer Reports, the consumer who bought new car Guarantees should not bear the cost of topping the oil.

The popular Consumer Reports publication conducted a study, as a result of which it turned out that many models of Audi cars, BMW and Subaru in the course of operation consume too much oil, as a result of which the owners of new warranty cars have to often pour it.

This study is based on a large number of car owners. About 1 million owners.

So the magazine managed to find out what oil is most poured, between planned replacements, owners audi brands, Subaru and BMW, which were released over the past 10 years. According to the results of the survey, it turned out that car owners accounted for very often to pour oil into the engine. Approximately 1 time per month or 1 liter for 1500-3000 km.

Here are the most voracious engines that consume a lot of engine oil:

- Audi 2.0-liter turbocharged engine with four cylinders and 3.0-liter V-6.

- BMW, 4.8-liter V-8 and with dual turbocharging 4,4-liter V-8.

- 3.6-liter six-cylinder and 2.0 liter engine Subaru., as well as a 2.5-liter four-cylinder.

Some of these engines are installed on the following models Car:

- Audi A3, A4, A5, A6 and Q5

- BMW 5, 6 and 7 series, as well as x5

- Subaru Outback, Legacy, Forester and Impreza

At the same time, as a result, the study of the journal specialists did not find confirmation of information that the consumption of engine oil between the planned replacements increases as the machine runs increases. At the very least, the direct link is not established.

As a result of the top of the oil in warranty vehicles, consumers spend on the maintenance of the car. Excessive funds for the purchase of oil on topping. In these motors used synthetic oil, the value of which on average is 400-1500 rubles per 1 liter.

As a result of the frequent topping of the engine oil into a new engine, the car owner can simply add up to 3-4 liters of excess oil, which will result in excess spending 4000-6000 rubles.

The most frequent complaints about the topping of oil come from the 5-series BMW owners that are equipped with the V8 engine. So according to Consumer Reports, the owners of these cars complained about 27 times more often than owners of other cars on the permanent top of the oil.

But it's not surprising because company BMW Initially, in all manuals on their models, indicates that oil consumption of 1 liter is 1200-1500 km. This is a permissible norm under certain conditions of operation of the car.

Recall that in all modern BMW cars, the planned oil change occurs every 15,000 km. So, the owners of some BMW models fill the oil, between that, on average more than 10 times.

This means that for 15,000 mileage, the oil topping mileage can be more than 10 liters. For average cost oil BMW In 890 rubles, it turns out that the owner of the new BMW can spend only one top of about 9,000 rubles. And this is if the oil is not acquired by an official dealer, but from third-party vendors.

Help: Motor oil consumption after 150,000 mileage This is a normal phenomenon due to the natural wear of engine parts.

What can the overseas of motor oil can speak?

As a rule, this means that some components were worn out in the machine engine, which lead to oil overrun. Usually it is an oil surcharge cap or piston rings. But if the car engine has passed more than 200,000-300,000 km, then the problem may be much more serious.

For the company Subaru, an acceptable level of oil consumption is 1 liter for 2000-2500 km. Compared to the BMW, the topping of the oil is at a more reasonable level, but, nevertheless, not acceptable to consumers, since the buyer of the car should not have time to spend extra money for the operation of the car, with the exception of planned then. Especially the new car is under warranty.

According to Consumer Reports magazine, this is a serious problem that is related to the rights of consumers. Therefore, every owner warranty car It is obliged to apply with an official letter of the brand with the requirement to include the fuel topping at the warranty case.

Of course, the chances of proving something in Western countries will definitely have. In our country, the owners of BMW, Audi and Subaru are hardly able to prove something or sue. Therefore, we advise all car owners the above stamps often check the oil level into engines and rolled it on time.

According to the representative of the company's company on the territory of Europe, the norm of the oil plot, between that, in Audi cars, is 1 liter for 1200-1500 km. That is, according to Audi, the oil consumption in the number of one liter per thousand with a small mileage kilometers, this is the norm, which corresponds to the factory norm and for car BMW.

As the Consumer Reports edition notes, not all engines in the above cars consume too much oil. As it was possible to find out as a result of the study, most cars from 2010 to 2014 are not required to top up the engine. But those cars of the same years of release that consume unnecessary engine oil make it very zealo. That is, a lot of engine oil consumes between service.

In general, according to Consumer Reports, it was possible to find out from 1.5 million cars, which participated in a survey of 2 percent of the machines have an increased oil consumption.

According to the Consumer Reports, regardless of the model and brand of the car, in the event of an increased oil consumption, the consumer must demand the elimination of a lack of goods under warranty. This requires repair of the engine at the station maintenance dealer.

But, as a rule, dealers protect themselves from such requirements and are usually prescribed by small font, the conditions that in the event of an oil topping within the amount of mileage installed by the manufacturer for a specific mileage, this will not be recognized as a warranty case.

If you have purchased a new car, and it consumes too much oil (you repeat the engine oil into the engine between the scheduled maintenance), then you should contact the dealer in order for it to eliminate the disadvantages of the car.

Before contacting the claim, it is necessary to carefully examine the guide to the car, in which, as a rule, explains what is a warranty case.

Also find the allowable oil consumption rate in the manual. If you push less than a manufacturer, it is unlikely that you can force the dealership of free work on the elimination of "Zhora" oil.

For example, as we have already written, according to BMW, all cars manufactured by the company can consume oil within 1 liter by 1,500 kilometers. According to the representative of the BMW, this oil consumption is placed in the permissible standard for all BMW cars besides the M-series, which can consume oil significantly more due to the design features of the powerful engine.

During the survey, the popular Consumer Reports edition found out that many car owners, acquiring the car, did not know that during operation, they would have additional costs associated with the oil fusion.

On the one hand, this is a violation of consumer rights. But on the other hand, many automakers secured themselves, warning the driver in advance in the manual on the machine that the oil topping is within a certain run. This is the norm, and not a flaw.

Here is a schedule that shows modern cars by the years, the owners of which are faced with frequent topping engine oil.

On the left is the percentage of complaints from among all surveyed car owners. From below the year of release.

As you can see, the number of owners of cars that fasten the oil into the engine falls as far as the release of the vehicle.

Table of car owner complaints on a frequent topping of oil into the engine shows the results of surveys of 498,000 car owners, which were released from 2010 to 2014. With this table you can see how the complaints change depending on the year of car release.

If the topping of oil does not suit you, then naturally many car owners have a question of how to prove to the dealer that the car consumes too much oil between planned replacements. To do this, you need to save checks for the purchase of oil you bought on top of the top. It is desirable that the oil also acquired at the dealer. The fact is that if you bought oil not an official brand dealer, the dealer can refer to the dubious quality of engine oil. If you buy oil in the dealer center, they will not be able to tell you that you were poured by poor-quality oil, which could cause an increased top of the machine during the operation of the machine.

Turning to the official dealer with the problem of oil overwhelming, ask them to spend your car special test that measures the oil consumption. This test will measure within a few weeks, how much does the engine of the engine actually goes.

If after the test it turns out that the oil consumption is higher than according to the specification to your model, the car will be repaired in accordance with the warranty conditions.

Nevertheless, even if the oil consumption of your new car is still slightly less than the manufacturer allows you, but it gives you a lot of trouble and excess spending moneyYou can still try to apply to court after the dealer refuses you to eliminate the lack connected with Zhor Oil.

Subaru car thanks full drive Won great popularity among lovers of outdoor activities, fishing trips, hunting. Legends and rumors talk about the resource of the engine at 100,000 km.

Destroy the myth of the resource of the opposite motor

Life time power aggregate depends on:

• constructive features;
• timely passage of maintenance;
• quality lubricants and fuel;
• compliance with the rules of operation.

1) Constructive feature - horizontal location of cylinders. Motors with this location are most prone to oil consumption.

Will not forget to say that the engines are highly thorough and spinning well. The disadvantages of the structure include insufficient cooling of the fourth cylinder, which over time leads to a characteristic knock on the cold, which disappears as heated. A new generation of engines with a chain drive of the gas distribution mechanism - 20b, prone to increased oil consumption.

2) Replacing the oil in the motor is recommended by the manufacturer once a year or when running 15,000 km., What will come before. However, no one mentions the events that are not recorded anywhere and are not taken into account with the rules of service. If you consider the fact of many hours, then in the year you can drive 15 thousand km, and the engine will work 500 hours, which will be 50 thousand km in the midway in the city of 50 km / h. Run. In the current situation, the oil agrees and loses its operational properties.

3) if you take into account that the oil you use exclusively original or the best quality, then unreasonable replacement Shows the reduction in the resource of the Subaru engine. The same contributes by poor-quality fuel containing a large number of resins and sulfur. Sulfur oxide, which is formed when combustion of fuel, enters with a reaction with water (condensate). The result of such a reaction is the formation of sulfuric acid, which causes corrosion. The oxide of iron at the same time, getting into the oil acts as an abrasive material and leaves on the walls of cylinders of the jacket. The contaminated air filter contributes to this.

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Low quality gasoline burns not completely. Not burnt fractions fall into the oil, which causes its aging, including the oil paraffinization.

4) It is worth paying attention to reading the operating instructions for Subaru. You can emphasize the following knowledge: the permissible speed of the car (after all, it goes); Checking the oil level before each fuel refueling (such a warning says a lot).

The above facts suggest that the resource of the subaru engine is limited to 80-120 thousand km. For turbocharged models and 140-200 thousand km. - For ordinary motors.

How to increase the resource and reduce the wear of the Subara motor

• Change more often oil: for turbo versions 5-7 thousand km, for the remaining 8-10 thousand km.
• Follow and execute manufacturer instructions
• Refuel

And there is another way, tested by time and leading research institutes, both Russian and foreign-it, is the use of repair and recovery composition, which allows you to compensate for wear, reduce the level of noise and vibrations, restore the geometry of the cylinder walls, reduce oil consumption. In contrast to common additives in the oil, the RVS additive creates a non-temporary film, and the metal-ceramic protective layer, which allows to increase the resource of the power unit to 120 thousand km. Run.

History Subaru Forester 2009, engine - EJ204, Mileage of the machine 45 thousand km. In winter, the oil pressure lamp caught fire. The client appealed to the C-car service by phone. It was recommended to check the level and add oil. The owner did it. Upon arrival at work, I decided to check the level. It turned out to be above the top mark twice. After that, I called a hundred. And in the evening the same day went to the service. The service decided to remove the pallet, and here are the results:

After conducting compression and vacuum diagnostics, it was decided to process. Processing was carried out in two stages. At the moment, Foreter mileage is 143,000 km. The timely use of the repair and recovery structure was able to compensate for the wear and increase the resource without interfering with the work and replacement of parts.

The reason for the failure of the subaru engine.

Recommendations of car manufacturers should be observed unquestioned. This has proven the next case that happened to the Subaru car. The owner of the car did not follow oil and regularly allowed its decline below the permissible level. What did it happen? Read our next expertise.

For the study, the expert was presented:

• Automashin "Subaru Impreza". 2006 release. Mileage 57705 km.
• Shot from an automatic engine internal combustion
• Subaru operating manual. LEGACY & OUTBACK
• Subaru warranty book. Subaru Motor.

The following questions stood before the expert:

1. Is there a "Subaru Impreza" car damage to the internal combustion engine?
2. If available, what are the reasons for the damage of the specified engine, production or operational character?
3. Is non-compliance with the owner of the rules of operation of the specified car, which caused the decrease in the oil level below the permissible level, the cause of the exit of the internal combustion engine?
4. Why did the engine level decreased in the engine?

With an external inspection of the car installed:

Missing and dirt on the details of the car, accompanying long-term oil leakage from the engine, are absent. On the outer surfaces of the pistons heads on the bottom - a layer of nagar and soot (photo No. 1 and photo No. 2) on the side, in the zone of the rings, - varnish deposits from yellow to dark brown. On the inner surfaces of the heads of the pistons, on the bottom and on the outer surfaces of the skirts of the pistons, under the heads and in the zone of buses under piston fingers, lacquer deposits from yellow to dark brown. Compression rings - movable, oil dialing rings partially lay down - mobility is hampered.

Photo number 1 photo № 2

Large varnish deposits on the bottom head of the first and third rods, lacquer deposition on the top head of the third rod. Minor varnish sediments, in the second and fourth rod. (Photo number 3 and photo № 4)

Photo number 3 photos number 4

Crankshaft - Risks, Zadira are observed almost on all shaft necks. The greatest damage on the first (photo number 5) of the root and rod cervix, and on the fourth rod cervical neck.

Photo number 5 Photo number 6

Camshafts - Risks, jackets on all cervical shafts of the left head of cylinders (photo. 6). On the right head of cylinders Zadira and risks on one neck of each shaft (photo.7). Zadira on the covers of the supports of the camshafts (photo. 8).

Photo number 7 Pictures number 8

Inserts - Zadira on connecting rod and indigenous liners.

The internal combustion engine has the presence of dark lacquer deposits on the pistons, which indicates an increased temperature mode of their operation. ("Tribotering" D.N. Garkunov. Mechanical engineering, 1989 pp. 282-283; "Lubricant and wear of diesel engines" A.A. Dryabin. Mechanical engineering, 1974 pp. 7-8) - a consequence of high heat loads of the engine (... Riding With the use of power close to the maximum, - in the sports style, at high speeds, for heavy highways with sandy, mud sites, steep lifts, etc. ... "Driving" No. 5 of 2007. p. 205). This is also evidenced by the difficult mobility of the oil-clearing rings in the grooves (the process of depositing varnish in grooves began). The presence of jackets on crankshafts and distributional shafts, on liners and caps of the supports indicates "oil starvation".

The lack of oil leads to a further increase in engine heat-stabbing (one of the oil functions in the lubrication system is the heat dissipation of the friction zones "internal combustion engines). The device and operation of piston and combined engines "A.S. Orin, MG Kruglov, M.: Mechanical Engineering, 1980s p. 166.

On the early process of emergency wear, the first connecting jackets are evidenced by crankshaft And dark lacquer deposits on the bottom head of the first connecting rod (photo. 3 and 5) - overheating first connecting rod.

All internal combustion engines consume oil in the process of working as a result of the pumping effect of compression rings ("Internal combustion engines. Device and operation of piston and combined engines" A.S. Orin, M.G. Kruglova, M.: Mechanical engineering, 1980g pp. 88-89). Insufficient mobility of the oil dialing rings enhances the process of oil charge.

The operation of the engine with an oil level below the permissible leads to air inlet (oil foam) into the oil - the oily pump intake and, ultimately, to the disruption of the oil film in severely loaded friction nodes. As a consequence, the process of engine destruction with external features similar to defects detected in the subarua car explored engineered ("Driving" No. 1 2008. p. 230).

Permissible oil consumption during operation, according to the operation manual - up to 1 liter in 2000km. After passing through-4, the under study by Subaru drove before the failure of 7330km. Thus, the oil consumption of a normally operating engine may amount to 3.665l. This is 73.3% of the total volume of oil in the engine.

Considering the unsatisfactory mobility of the oil dialing rings, the actual oil consumption can be higher.

Output:

1. In the Subaru car there are damage to the engine of internal combustion in the form of jackets of connecting rod and indigenous liners, plotting of the crankshafts, loops of the necks of the camshafts and crankshafts, partial occurrence of the oil-circuit rings.
2. The reasons for the breakdown of the specified engine - operational nature.
3. The internal combustion engine failed due to non-compliance with the owner of the rules of operation of the specified vehicle in terms of regular replenishment of oil decreasing

Result:

Having studied all the materials of the case in a lawsuit was denied.

Oil consumption

Part of the engine oil burns during lubricant. So oil consumption is a completely natural process. Well-rolled engines consume 0.2 liters per 1000 km, Audi calls the maximum permissible consumption of 1.0 l per 1000 km.

Oil consumption Your Audi 80 depends on the following circumstances:

• Overflow oil leads to high consumption, because the ventilation of the crankcase blows it over.
• Liquid oil burns faster than thick. Seasonal oil becomes in a heated state of liquid as water, and accordingly increases consumption. All-season oil remains more damaging; First of all, those who go to long distances can notice the smaller consumption of this oil.
• All-season butter, which remains in the engine for too long, becomes more liquid, the highest class of viscosity is "lost", respectively increases the need for a plot.
• A sharp driving style besides an increased gasoline consumption increases oil consumption. This is especially noticeable if the new engine is subjected to large loads.
• During running, the engine needs more lubricant.
• Motor leakage. Check according to the scheme described in the chapter Engines.
• Defect in the engine; For example, a sealing gasket defect (oil-circuit cap) valve rod, too big Clearance between the guide and sealing gasket of the valve, the piston rings are defective or incorrectly installed

Zero oil consumption is suspicious

With winter operation at short distances, it may also be that the oil level between measurements is not reduced at all or even increases. This is not a reason for joy, because it means that the engine oil is diluted with fuel or condensate. This varies its properties to the oil must be "boiling" during regular long-distance trips so that condensate evaporated. At the end of the trip, check the oil level, because it will significantly drop due to the evaporation of parts of gasoline and condensate! With extreme exploitation in the city without intermediate trips to long-distance distances, it will be better if you change the oil before usual; Perhaps after 3000 km or four months.

In winter, it should be considered an admixture of gasoline in oil in about 2-3%, and due to the better dosed enrichment of a combustible mixture in our injection engines when the cold engine is started into the oil, less gasoline falls than in old carburetor.

Proper oil specification

Since with a relatively long, 15,000 km, oil replacement intervals There is a risk of precipitation in oil Carter, Audi has released strict regulations for oil.

• The usual mineral oil must comply with Volkswagen 50101 (VW-NORM 50101). In this case, it has sufficient cleansing properties to prevent precipitation.
• Oils with good antifriction properties reduce internal friction in the engine. They must comply with the standard 500 00 (VW-NORM 500 00).
• Only if the oil is not available from the above, it is possible to apply all-season or seasonal oil categories "API SF" and "API SG" for the topping.

Oil viscosity

Oil fluidity, i.e. its viscosity, must comply with the requirements for use in this engine. At the same time, two criteria should be remembered:

• Oil should not be too viscous, as the starter must be able to turn cold Engine, and places where oil falls in the engine should be blurred immediately after starting the cold engine.
• Oil should not be too liquid because high temperatures And the engine revolutions can break the lubricating film.

SAE classes

The American Society of Automotive Engineers has distributed oils by classes according to their viscosity.

Seasonal oil

These classes begin with motor oils with liquid winter (Winter) SAE 5W, 10W, 15W oil through the intermediate stage of SAE 20W / 20 to viscous SAE 30, 40 and 50 summer oils.

The cheapest motor Oil It used to have seasonal oil. For impeccable engine lubrication in it, viscous or liquid seasonal oil should be flooded in it. Seasonal oil today is almost impossible to find on refueling or in supermarkets, but it is often used in fleets. For use in Audi 80, it is suitable (and this is the opinion of the producer itself) only as a temporary solution in a hopeless situation.

All-season oil

The production of all-season oil used today is more complex, and therefore all-season oil is respectively more expensive than seasonal. As a additive that improves the viscosity index, it presents long chains of molecules that "swell" when heated and is again losing in the amount when cooling. In this case, the oil can be "elastic" to adapt to temperatures and cover many classes of viscosity. SAE oil 15W-50 corresponds at a temperature in -15 ° C of the class of viscosity 15w, and at 100 ° C - class 50.

Problematic with all-season oils based on mineral oils It is the fact that chains of molecules that improve viscosity are decomposed and in this case the oil becomes not so resistant to temperature effects. For this reason, AUDI does not allow to apply into their cars all-season oils SAE 10W-30 and 10W-40 classes in the warm season.