Audi 80/Avant (B4)

The engine oil part burns down during lubricant action. So the oil expense is absolutely natural process. Well обкатанные engines spend 0,2 l for 1000 km, Audi names as much as possible admissible indicator the expense of 1,0 l on 1000 km.

The expense of oil yours Audi 80 depends on following circumstances:

• The oil modulation leads to the high expense because ventilation картера blows its surplus.
• Liquid oil burns down faster, than dense. Seasonal oil becomes in разогретом a condition liquid as water, and the expense accordingly increases. All-weather oil remains to more viscous; first of all those who goes on a long distance, can notice the smaller expense of this oil.
• All-weather oil which remains in the engine too long, becomes more liquid, the higher class вязкоти "is lost", the requirement in доливке accordingly increases.
• Sharp style of driving except the raised expense of gasoline increases also the oil expense. Especially strongly it is appreciable, if the new engine is exposed at once to the big loadings.
• In time обкатки the engine requires in большем quantity of lubricant means.
• leakage the engine. Check up under the scheme described in the head Engines.
• Defect in the engine; for example, defect of a sealing lining (маслосъемный a cap) a core of the valve, too big backlash between a directing and sealing lining of the valve, piston rings are defective or incorrectly established п

The zero expense of oil is suspicious

At winter operation on short distances can be and so that oil level between measurements is not diminished at all or even increases. It at all an occasion to pleasure because means that engine oil is diluted with fuel or a condensate. This oil changing the property is necessary for "boiling" during regular distant trips that the condensate has evaporated. In the end of a trip it is necessary to check up oil level because it considerably will fall because of evaporation of parts of gasoline and a condensate! At extreme operation in a city without intermediate trips on a long distance it will be better, if you change oil before the usual; probably, already after 3000 km or four months.

In the winter it is necessary to reckon with a gasoline impurity in oil approximately in 2—3 %, and thanks to better dosed out enrichment of a gas mixture in ours впрысковых engines at start of the cold engine in oil gets less gasoline, than to the old carburettor.

The correct specification of oil

As at rather long, 15 000 km, intervals of replacement of oil there is a danger of formation of a deposit in oil картере, Audi has let out strict instructions to oil.

• Usual mineral oil should correspond to standard Volkswagen 50101 (VW-Norm 50101). In this case it possesses sufficient cleaning properties for prevention of formation of a deposit.
• Oils with good antifrictional properties reduce an internal friction in the engine. They should correspond to the standard 500 00 (VW-Norm 500 00).
• Only in the event that oil from listed above is inaccessible, it is possible for доливки to apply all-weather or seasonal oil of categories API SF and API SG.

Viscosity of oil

Fluidity of oil, that is its viscosity, should correspond to requirements for application in the given engine. Thus it is necessary to remember two criteria:

• Oil should not be too viscous as the starter should be able turn the cold engine, and places where in the engine oil gets, should be greased immediately after start-up of the cold engine.
• Oil should not be too liquid because at heats and engine turns the greasing film can be broken off.

Classes on SAE

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

Seasonal oil

These classes begin at engine oils with liquid winter (winter) oils SAE 5W, 10W, 15W through intermediate step SAE 20W/20 to viscous summer oils SAE 30, 40 and 50.

Seasonal oil was the cheapest engine oil earlier. For faultless greasing of the engine in it viscous or liquid seasonal oil should be filled in according to a season. Seasonal oil cannot be found today on refuellings or in supermarkets, but it still is often applied in motor-vehicle pools. In Audi 80 it suits application (and such is opinion of the manufacturer) only as makeshift in a desperate situation.

All-weather oil

Manufacture of all-weather oil applied today is more difficult, and consequently all-weather oil accordingly more expensive, than seasonal. As an additive improving an index of viscosity, at it there are long chains of molecules which "inflate" at heating and again lose in volume at cooling. In this case oil can "elastically adapt to temperatures and cover many classes of viscosity. Oil SAE 15W-50 corresponds at temperature in–15C to a viscosity class 15W, and at 100C – to a class 50.

At all-weather oils on the basis of mineral oils that fact is problematic that the chains of molecules improving viscosity, decay in due course and in this case oil becomes not such steady against temperature influences. For this reason Audi does not allow to apply in the cars all-weather oils of classes SAE 10W-30 and 10W-40 in a warm season.