I bought a new '07 boat last year with a new '07 150HP Optimax motor. I also asked the dealer to sell me a case of oil for the motor so I would have plenty for the year. The dealer sold me the QuickSilver Premium oil to use with the boat. Recently fished with another OptiMax engine owner. He has an older 225HP OptiMax (maybe '02) and he told me I was crazy to not be using Mercury's OptiMax oil. He said that a very reputible engine guy from this area (within 30 minutes of Louisville) told him you have to use the Mercury OptiMax oil or you will have engine gumming problems. Anyone have any insight on this?

Any insight would be greatly appreciated.