Hi there,
This is a very topical question just now as we are discussing this very issue in depth in our mods forum. Firstly i like to see the engine serviced every 5,000 Km's with 10K being the extended limit. As for the oil if you have been using mineral and you change to synth you may experience some oil burning issues, i have added a link of a post i did a short while ago, on the results of using synth and mineral oils..
mark (mhpautos)
https://www.2carpros.com/forum/1992-audi-100-car-smokes-now-vt300415.html
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Thursday, August 27th, 2009 AT 6:13 PM