I just picked up my 05 GTI Base this week. Seems to have plenty of oil in the reservoir for now. But, not being familiar with the consumption rate, I want to pick some up so that I will have it when it is time to add. I have no PWC dealers near me - just your typical retain chain auto parts stores and Wally World. The operators guide says to use XP-S synthetic 2-stroke or XP-S mineral injection oil (or equivalent). But I'm not sure what is equivalent. I haven't found anything in the local stores that states XP-S either in a synthetic or non-synthetic 2-stroke oil. I have, though, found several varieties of 2-stroke oil that say they are for watercraft, including PWC's but I don't see any references to XP-S on any of them. Is this a Sea Doo brand reference or something else? I guess my actual question is: assuming I can't find something with a Sea Doo brand name on it, what should I look for as an equivalent?