Are you supposed to 'hear' blow-by? When I took the oil filler cap off today, there was more smoke coming out there than at the exhaust and I heard a sound like a defective exhaust pipe, not very loud, though, but definately audible. How bad is that? Should I start looking for a new engine?
In addition: no start below 30, won't stay running after coldstart, once warmed up idle speed jumps up and down between 700 and 900 rpm but runs fine then.

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