Guys I don't know what year model... but the motor runs sweet, and I would like to keep it running that way. The old man that I bought it from did not know anything about what oils that had been used. So are there any recommendations what oil to use... right now I am using QuickSilver Prem. Also, want is the recommendations for the lower unit... what brand and grade oil am I to use for it. All assistance is greatly apprciated. I am a greenhorn and this is my first boat.