I had a new lower end put on my 6 hp..i later found milky oil...after showing it to the boat mechanic, they said it was not water but probably grease that they stick on something in the engine when they did then lower end. also the lower end gasket was leaking water to the outside of the motor....so they took it apart and replace the gasket. I just used it two mornings and now the oil is milky again..They said they ran it for 15 minutes and everything looked good...i wondering if they applied new grease to that part again and now it contaminated the oil again. do you think i should change the oil again and see if it happens again or is something wrong...also, is it possible to get gas in the oil and would that also make it look milky?