Don't be fooled by all of the advertising hype. The three most important factors are the API rating, the proper viscosity, and the frequency at which you change the oil. I have never gotten less than 150K miles out of a car (I currently own 4, each with more than 150K miles) and I have never had any oil-related issues. There is virtually no sludge in my engines. Today you should look for an API rating of 'SN' for gasoline engines. I buy the cheapest 'SN' rated oil I can find and I change it every 3500 miles. Use the viscosity recommended in your owner's manual.
THE best oil is AMSOIL, but since it's $12/qt I now use Rotella T6 (synthetic) from Walmart
The best oil for Audi 1.9 TDI is CASTROL 0W30 SLX Longlife II (TDI Pump Nozzle) VW Norm 506.01 . This oil is issued by Castrol special for TDI - Pumpe Duse (Pump Nozzle) engine as longlife oil (50,000 km service interval, or two years).
Also a normal service oil (15,000 kmservice interval, or one year) is Castrol TXT 5W40, and Castrol EDGE 5W30, for TDI Pump Nozzle engines, VW Norm 505.01.
SOURCE: best oil to use for audi 80
Please click HERE for information about oil, and selecting the correct weight. There are different variables to consider when selecting the "best" match for your car - like type of use, climate, etc.
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