I was curious as to what oil you guys are running and why. I understand that marine engines are loaded more and experience stress differently that their land locked brethren. A jet boat motor is like an engine running on a dyno being loaded constantly and the thrust faces of the main bearings see a lot of wear as a result. I am using Valvoline VR1 racing 20w-50 because it has more zinc additives in it than most other oils. I was just wondering because we put so much time and money into our engines and we are seeing power levels that are not seen on pavement that much.