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40 Deluxe · 07-22-2021, 10:48 PM

Detergent oil turning dark is normal. If the oil is "blackish" it could be from the carb running too rich. Even if no black smoke is seen coming out the tailpipes, the mixture can be so rich that excess fuel ends up in the oil.

07-22-2021, 10:48 PM	#4
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: blackish engine oil Detergent oil turning dark is normal. If the oil is "blackish" it could be from the carb running too rich. Even if no black smoke is seen coming out the tailpipes, the mixture can be so rich that excess fuel ends up in the oil.