okay, I used the search button but did not find out much

Changing oil in wifes VX pumped out almost 1/2 gallon looked in resevoir with flashlight and there is no more oil in there is that all I am going to get out?

Synthetic oil do you recommend it? What about in my SHO? I saw where several guys in Sea-Doo forum did not recommend synthetic on supercharged engine, something about clutch slippage?