I've always heard that it's best to change the oil and filter after running any type of fuel system additive to get rid of the carbon particles that are broken loose (and can end up in the crankcase) during the process. Is an after-use oil change recommended in the directions on a can of Seafoam?
And could the white smoke experienced by some simply be a by-product of the petroleum based chemicals being circulated with the engine oil, and being burnt off in the combustion chamber, after a crankcase treatment? I've smelled Seafoam before and it smells somewhat kerosene based.
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