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1996 Yamaha 9.9 Four Stroke water in oil

midgetorama

New member
Hello,

I’ve been trying to find a definitive cause of the milkshake oil I’ve been experiencing on this kicker. Most of the searches indicate it could be a thermostat stuck open creating condensation.

I can’t imagine that the oil is being contaminated by condensation after only 3-4 hours of run time on a fresh oil change. I’ve changed oil three times and run the motor in a low-rpm trolling condition then checked the oil with the same result.

Does anyone have some additional thoughts on the source of the water?

Thanks!
 
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