Quote:
Originally Posted by Lester
Where does all that crap come from? Since these are direct injection, the only other source must be turbo air, is it that cruddy?
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Crankcase vapors! PCV (or CCV crank case vent) is where the oil vapors come from and buildup on the hot intake valves.
Blame D.I. and long oil change intervals - hence the oil gets thinner/diluted and ends up on your intake valves.