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This is a difficult question since it is relative, however here it goes. I've looked at several non-turbo engines (4 and 5 cylinder), and they all seem to have a lot of blowby as observed when I remove the oil filler cap or "valve cover to intake return hose". When I say a lot, this is relative to my experience with gas engines. A gas engine with this much blowby would cause me concern. Do these engines typically have a lot of blowby relative to a gas engine when not at operating temperature or otherwise ? One owner proudly pulled the dipstick out and commented on the lack of blowby. His pride diminished when I open the filler cap. I suspect the dipstick tube is below oil level. These engines were in undriveable cars so they may not have been be at operating temperature. I didn't notice blue smoke from the tailpipe but there did seem to be a lot of whitish tailpipe smoke at idle.

Any thoughts ?

Thanks !
 
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