Audi 80/Avant (B4)

since 1991-1995 release

Repair and operation of the car

The part of engine oil burns down during lubricant action. So the consumption of oil is absolutely natural process. Well rolled engines spend 0,2 l for 1000 km, Audi calls the most admissible indicator an expense of 1,0 l on 1000 km.

The oil consumption your Audi 80 depends on the following circumstances:

• The modulation of oil leads to a high expense because ventilation of a case blows its surplus.
• Liquid oil burns down quicker, than dense. Seasonal oil becomes in the warmed state liquid as water, and the expense respectively increases. All-weather oil remains to more viscous; first of all those who goes on a long distance, can notice a smaller consumption of this oil.
• All-weather oil which remains in the engine too long, becomes more liquid, the highest class of a vyazkota "is lost", the need for a dolivka respectively increases.
• Sharp style of driving except the raised consumption of gasoline increases also an oil consumption. Especially strongly it is noticeable if the new engine is exposed at once to big loadings.
• During a running in the engine needs bigger quantity of lubricant means.
• Leakage of the engine. Check according to the scheme described in the head Dvigateli.
• Defect in the engine; for example, defect of sealing laying (an oil scraper cap) of a valve core, too big gap between the directing and sealing laying of the valve, piston rings are defective or incorrectly established p

The zero consumption of oil is suspicious

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

It is necessary to reckon with gasoline impurity in oil approximately in 2 — 3% in the winter, and thanks to better to the dosed enrichment of gas mixture in our vpryskovy engines at start of the cold engine in oil less gasoline, than gets to the old carburetor.

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 an oil case, Audi issued strict instructions to oil.

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

Viscosity of oil

The oil fluidity, that is its viscosity, has to conform to requirements for application in this engine. Thus it is necessary to remember two criteria:

• Oil should not be too viscous as the starter has to be able to turn the cold engine, and places where in the engine oil gets, have to be greased immediately after start-up of the cold engine.
• Oil should not be too liquid because at high temperatures and turns of the engine the greasing film can become torn.

Classes on SAE

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

Seasonal oil

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

Seasonal oil was the cheapest engine oil earlier. For faultless greasing of the engine in it viscous or liquid seasonal oil has to be filled in according to a season. Seasonal oil cannot almost be found at gas stations or in supermarkets today, but it still is often applied in vehicle fleets. In Audi 80 it suits for application (and such is opinion of the producer) only as makeshift in a desperate situation.

All-weather oil

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

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