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1992 40HP Merc Black Sludge From Exhaust

CG Chris

New member
I have a 1992 Mercury 40 hp oil injected motor and I found a puddle of black sludge leaking out of the prop exhaust area. I checked the lower unit oil and it was clean meaning still blue in color no white frothy stuff and no leaking around the prop seal.
I did a lot of idling last week while trolling which I normally don't do if that helps narrow it down.
Thanks for any leads.
 

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