my 3hm35 starts well, doesn't smoke, and doesnt use oil
until this event occurred (hours on engine
unknown). I usually motor
at 2000 to 2200 rpm
but to clean things out a bit I ran it at 3200 rpm
and after a few minutes I noticed oil
mixed in with the exhaust water
. shut the motor
down and checked the oil. it was overfilled and appeared to have water
(gray/green color). changed the oil and then motored back to the marina (about 4 hours) at 2000 rpm. no oil in exhaust
and no water in oil sump when back at marina.
questions: what caused the two to mix...bad head gasket
? other gasket/seals? why did it not re- occur at 2000 rpm? safe to keep using the engine
? I have not run it again at higher rpm because I am chicken, (lol!) but would like to know more about the cause.
any ideas from those with more knowledge/experience?