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I think it may be Oil Sludge,
Oil sludge will clog the oil bays, and only allow oil through at higher pressure/ higher RPM.
Easy to tell, Do you use Synthetic?? Latest VW/ Audi Tec Bulliten states to ONLY use Synthetic oil, Due to oil Sludge problems on 1.8t engines.
If you dont that may be whats wrong.
Easy way to tell, pull off the valve cover, and if its coated with sludge on the parts inside, thats whats wrong.
Oil sludge looks like cold hot fudge, not thin like oil.
This is my $.02
Cant tell for sure without hearing it.
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