I have a 1996 Catalina 30 mk III with a universal 25xp. The engine has about 2000 hours on it and I change the oil once a year. I have been using Delo 400LE oil as it is recommended for diesel engines. I would like some expert advise on switching to Mobil 1 or some other synthetic oil. It would be my desire to expand the life of the engine in doing this. What do you think?
Greg
Greg