I have a 2002 135. In the morning I give it a nice heavy run out to where I want to fish then troll around for a few hours. I like to move around so I pull the rods and get on it for a while. My dad and I were out a few weeks ago and we didn't really get on it at all...3/4 of the day the motor seemed to start acting up. He suspected it was doing so because we hadn't ran faster than 2-3mph all day, even when we went out to where we were fishing we were trying to dial in the Hds5 fishfinder so we crawled out. We checked the oil lvls, all was well so called it a day and ran it hard for a while, haven't had any problems since.