Had a 3.7 in one of my previous boats. It ran great with no signs of trouble. I always checked fluid levels. Without warning I blew a seal and a gasket and never knew it until it was too late and the boat started started shaking like it was in a washing machine. Pulled the engine cover a had coolant and oil all over. I was stranded in the Lake Ontario floating towards Canada - that was enough for me - Wont buy a boat with another one in it.