This has come up a few times before. Go check out Audi USA for tech bulletins regarding oil sludge on 1.8Ts and/or talk to your local dealer. If I'm not mistaken, there has been a voluntary recall by Audi on 1.8T engine failures due to oil sludge.
In the future, Audi recommend you use synth oil in these ebgines to avoid sludge build up.
Good luck.
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