I had that in both of my Audis 1.8t and 2.8.
Used "Rislone engine cleaner", gradually went away. It slowly remove the sludge.
Prepare 2 oil filter and oil as it will get dark from the cleaning. (Writing this make me sound like a snake oil sellers, but it worked as intended)
Step
1. keep the oil filter, poor complete Rislone container in (dont overfill the engine, remove oil if needed),
2. After 3000 km, drain oil, replace filter, (use cheap oil)
3. After 3000 km, drain oil, replace filter, (use cheap oil)
4. Use quality oil and a new filter, problem should be solved!
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