Oil in water while starting

DJD

Cadet
Joined
Mar 23, 2019
Messages
14
I noticed some black oil in the water off my swim platform after I just started it up (Mercuiser 260 1983) not like sheen …
it was like old looking oil that just got a cup or so spilled in the water. I had changed my oil a couple weeks ago so my engine oil its nice and golden colored only ran it for like an hour since the change … . I do not know if this stuff came out the cold water cooling system or the engine exhaust …. any idea's what I could look for ?
Thanks
 

Rick Stephens

Admiral
Joined
Aug 13, 2013
Messages
6,118
Check the oil in the drive. Inspect everything.

Is possible or even probable that an older engine has a lot of blowby and leaky valves and leaks into the exhaust.
 

GA_Boater

Honorary Moderator Emeritus
Joined
May 24, 2011
Messages
49,038
It could be soot from a rich start. Was it kinda gray looking and not solid, more like grayish spots on the water?
 
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