How many hours are there between oil changes on a marine engine? And, might this not be a better indicator for oil change intervals, due to the fact that some people endure traffic (idle time at lights, etc.), wilst others have the pleasure of missing such a great time (well, until you tourist show up anyway, and drive slow in the left lane looking lost, with a map infront of you, and McD's boxes on the console
)
Anyway, before I get carried away, has anybody thought about changing their oil based on engine run time? (besides the 3 month interval)