I would like to get some thoughts on engine hours. So a Yanmar 55 hr that has 3,600 engine hours, oil changed each 100 hrs, injectors service at 2,200, Value serviced at 2,400, etc. Engine fires right up, no smoke, no excessive oil burn, no discharge in engine room ext. Dose this engine have to many hours? Boat is a 2005. When do engine ours become a concern? I have talked to two Yanmar certified dealers and one general machanic. They say it depends on neglect, Diesel engines develop corrosion when they are not run much and are not run hard. I have another dealer that says you have to rebuild the engine at 5,000 hours period. Then a four dealer tells me the 5,000 rebuild thing is for high performance Yanmar like you fine in big power boats. So what do ya’ll think?