My brother recently decided that it was time to get the old boat that our grandpa has had stored behind his house fixed up and ready for operation. After a couple days of work, he decided that it would be much cheaper to buy a completely new boat motor, than fix the old one. He ended up getting a brand new motor and rigging it on the old boat.
The person that he bought it from recommended Mercury Optimax oil to ensure that the boat motor was functioning at its best. My brother decided to follow that advice and filled the motor with this type of oil. When he finally got to take the old boat out this week, he was impressed by the performance of the old boat.