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Old 11-26-2017, 10:32 PM   #7
Al's Avatar
City: ketchikan, Alaska
Country: usa
Vessel Name: 'SLO'~BELLE
Vessel Model: 1978 Marben-27' Flybridge Trawler(extended to 30 feet) Pilothouse Pocket Cruiser[
Join Date: Apr 2012
Posts: 1,997
Cold engine with slack in the clearances allow oil to drop down the valve guides and pistons pick up oil with pistons slack against the cylinder walls. This causes blue smoke on start up. White smoke should not really be involved on a startup. rather it indicates a cooling leak, head gasket, cracked head/block allowing water into the exhaust.
Dark gray or more black, over fueling, injector pump issue or injectors. Surprised these three observations were not first out of the box, while the ones given do fit the OP's questions, just seem to lack a bit.
Good discussion subject, trust others will jump in.

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