My father has always been very particular about what kind of oil goes into his boat motors. He is careful to make sure that all of the boat motors that he owns use the type of oil that is actually best for their operation. Since he has a couple of different motors on the different boats that he uses, he has a few different types of oil that he uses regularly in the different motors.
In one of his newest motors, he has decided to start using Mercury premium plus oil. He did a lot of research on the motor and the kind of oil that it would need before deciding on a brand and type of oil to use. This is the type of oil that a lot of people that he has asked about the motor have recommended. So far he has enjoyed the way that the motor runs with it.