geophb
Well-Known Member
1. Egr deposits are very minimal on a gasoline engine. So yes, the primary source is from pcv.1. Do you still think that crankcase pressure is the primary source of valve deposits? Take a look at EGR and variable valve timing to see what contributions they make.
2. Also nobody has been able to quantify the problem of intake valve deposits.
2.
Edit: Whoops I think I read it wrong
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