oil or gas slick coming from my engine.

by mark
(boynton beach fl. usa)

I have a 2004 Yamaha 150 4 stroke engine. when the engine is up and a wave hits the bottom of the engine a small oil slick appears. It doesn't seem to happen until a wave goes over the exhaust vents. is this normal? it has done it for a few years but my dock master called me out on it just recently.

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