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You need to use an oil with a VW 502 certification and an ACEA A3/B4 rating. These oils are normally 5w40 or 0w40. Personally I use Mobil One 0w40 and a Napa Gold filter. I change the oil every 5,000-10,000 miles depending on how the car is used during that oil cycle. For instance, last winter 90% of my driving was short, 1.5 mile trips with a lot of idling in cold weather. It has been only 4k miles since last Oct and it is going in this week (4-5-12) for a change. The change before that was mostly 80+ mph 100 mile trips twice per week, I changed that out at 11k miles as well as sending a sample out for analysis and it still had a plenty of reserve left. I could have gone another 2-3k miles. I will also be sending out this 4.2k change for analysis.

The manual recommends changing every 7,500 miles with VW 502 certified oil under average driving conditions

In summary, the Audi 1.8 and 2.0 turbos, as well as the 2.8 v6, require VW 502 certified oil. I use Mobil One 0w40 which has that cert (read the back of the bottles). I am at the 175,000 mile marker on my 2002 model Quattro with the sport package and it runs stronger than ever and burns not a drop of oil. It has a stage 2 programmed computer with #32 injectors bringing horsepower to 225. Its very strong on the top end, pulling strong from 60 on up to about 145 mph with 15 lbs. of boost (stock was about 7 lbs. of boost) yet pulls very well from 2,500 rpms as the torque was also bumped from 170 to 275 lb. ft.

It is imperative that you change the timing belt every 70k miles. It is an "interference" engine so if the belt or tensioner fails, the engine is junk as the pistons will collide with the valves.

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Q: What motor oil viscosity need for your Audi a4 quatro?
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