Originally Posted By: Jason Adcock
- VW/Audi 1.8L I-4
Pretty much any turbo engine that is operated with mineral oil will most likely sludge up. But that's like saying that the human body is prone to developing high cholesterol if you feed it nothing else but McDonalds.
No sludging issues were reported on this engine in Europe, where it was fed proper synthetic oil.
So yeah, here in the US, getting a used VAG 1.8T engine is risky just because VAG did not mandate the correct oil straight from the start.