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Thank you for your time and advice.

Yes it was confirmed and I still have the second o ring. It was done about 2 weeks ago. Can I just open filter canister and see where it goes?

I recently purchased a Audi a8 quattro 4.2 fsi and had the oil and filte4 replaced. The filter came with (2)o-ring(s). The shop said that the second o-ring wasn't needed. Since then,I've noticed it now has a leak. I'm not a mechanic but why would the filter have (2)o-ring(s) in the box with new...