I use 10W40 in my 20v. I've been doing that now for over 140k miles since I got it 16 years ago.
No plans to change to anything else.
10W30 really only started when they went to all alloy engines. Some of the newest ones are 0W20. Not suited to your Audi 100.
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1991 90 quattro 20v sport
1991 90 quattro
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