The SAE designation characterizes the viscosity of the engine oil.
Example: SAE 10 W 40:
- 10 - Viscosity of oil in a cold state. The lower the number, the lower the viscosity of the oil.
- W - The oil is suitable for use in winter.
- 40 - Viscosity of the oil when hot. The higher the number, the lower the viscosity of the hot oil.
The viscosity of the oils used for «flexible» maintenance schedule
The viscosity of the multigrade oils used for «tough» maintenance schedule
Gasoline engines
- A - VW 500 00 with a date no later than 10.97 and VW 502 00 (turbocharged models)
- B - VW 501 00 with a date no later than 10.97
Diesel engines
- A - VW 500 00 together with VW 505 00 with a date no later than 10.97
- B - VW 505 00, VW 505 01 with a date no later than 10.97
Longlife engine oil
AUDI A4 engines are filled at the factory with special Longlife oil. When using Longlife oil in accordance with VW regulations, a two-year service interval is provided.
Ordinary motor oil according to VW regulations can also be used. But in this case the service interval must be reduced to 12 months/15.000 km.
Oil types are listed in Specifications.
Warning: If there is no Longlife oil to fill the lubrication system, you can fill in 0.5 liters of engine oil according to VW 502 00 (Gas engine) or according to standard 505 00/505 01 (diesel engine), without setting the service time indicator to «nicht flexibel» («not flexible»).
Oil consumption
For internal combustion engines, oil consumption refers to the amount of oil that is consumed as a result of the combustion process. Oil consumption should not be confused with oil loss due to leaks in the oil pan, cylinder head cover, etc.
Normal oil consumption occurs due to the combustion of a small amount of oil in the cylinders, due to removal with combustion products and wear products. In addition, oil is lost due to the high combustion temperatures and high pressures that occur during engine operation. Oil consumption is also affected by external operating conditions, such as driving style, as well as manufacturing tolerances of engine parts. Oil consumption should not exceed 0.8 l/1000 km.
Caution: Never fill oil above the Max. If an excess amount of oil has been poured, it must be removed. Otherwise, the catalytic converter may be damaged, as unburned oil enters the exhaust system.
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