[sammyg2]

There is a big difference between outboard engine oil (PWC's fit in the same category) and motorcycle engine oil.
Personal watercraft and outboards require TWC-III rated oil, it is water soluable, ashless, and works in the lower temps of the water-cooled engines.
If you put regular motorcycle oil in an outboard you are asking for stuck pistons.
My personal favorite for my waverunners is yamalube but you have to make sure it is the TWC-III version.