In my 2020 A6 I had aral oil and it consumed 1l of oil in 15k km. Then I used castrol LL and now it does not consume a drop at all.
Whatever weight the owner's manual says it takes, I'd use that. You'll definitely want to go with a high quality oil though. I personally use Liqui-moly... I have 192,000 on my 2012 A6, and she's still purring right along, a lot of which in my opinion has to do with the higher end oil.
Got an oil change @ 94.1k using liqui moly 5w40. Low oil Light popped up at 96.4k. (Added 1 quart). Now I’m at 96.6k. Checked again and the bar is just one level under the “max” Why am I burning oil so quick?
I have a C7 3.0T A6. I put about 2 quarts of oil in it in between oil changes depending on how hard i drive. I don't have a check engine light. The engine doesn't knock, it runs fine.
I had the same issue on my 2019 A6 3.0 last year. Two times I had to pop into the dealership to have oil removed (no charge) and the issue was due to dilution and short trips.
I used Amsoil 5w40 European Car formula or Gulf 5w40 Formula G in my A6 previously. Technically Amsoil doesn't have the have the VW 502 00, 505 00 certifications so I think I will start using Gulf Formula G or GX exclusively in my R, either the 5w40 or 5w30 grade.
Start by getting rid of that junk liqui moly and replace it with ROWE RS 5w40 (i can link many kits if need be)
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This part for Audi A6 is made around the world. We have reviews for engine oil manufacturers from countries such as: Germany, USA .
In March 2026, the ranking of engine oil for Audi A6 on PartReview included 4 manufacturers. It is based on 7 reviews and 25 votes.
Last month, PartReview users preferred Castrol. 12% of positive votes went to this manufacturer.
In second place: engine oil LIQUI MOLY — 0%.
Third place: OEM Audi with 0% of the votes.
In the overall ranking of engine oil, which aggregates opinions of owners of different car makes and models, these brands hold the following positions:
After seeing which engine oil owners of Audi A6 prefer, check other popular parts for this car. In March 2026, leaders on PartReview were:
