I apologize Sunruh. Wanted to reply to your post and simply forgot. While my search for bigger, better, faster oils always goes on, I think I might be good using the Kawasaki Jet Ski 10w-40 oil. IT's 5.95 a quart at the dealer and I get an additional 10% off for being one of their customers. I'm good with 5 and some change per quart. I'm limiting myself, for simple warranty purposes, to oils that are FC-W certified as that's what the manual calls for. Just for giggles, in the near future, I might give the Mystik Watercraft 10w-40 a go just to compare it to the Kawasaki oil. Thanks for your input, it's always appreciated.