I just purchased my Seadoo and do not know which kind of oil I should use. I believe that it is either the BRP XP-S synthetic or the BRP Mineral oil. Please Help!! THANKS|||XP-S synthetic looks like the one you should be using. This is a link to a site that has old operator's guides to Seadoos. I'm pretty much certain that it's the XP-S synthetic, but I don't want you to harm your engine by using the wrong oil so you can feel free to take a look for yourself at some of the operator guides.
Hope it helps