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I appreciate your concerns. I too had an audi service and I suspect had an oil overfill leading to an egr problem, where excess oil was being burnt off. Can't be definite. My suspicion though. I hadn't had a problem previously.
Every service since I have insisted oil level fill on service oil change to be mid or on level below max on mmi. No problems since. If at service it shows 'max' it could be over, in my opinion.
I always now supply my own oil and filters to my technician.
 
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