Hello. i have a 2000 SeaDoo Challenger that i bought a year ago with no key, so i took it to a shop had him look it over while it was there for the key. he had the boat for over a year, and finally fixed some of the issues. the Dude went out of business, and i was able to finally get the boat back. i had someone pick it up for me, and they didn't ask all the questions of what was done. both motors run, but my question is: how do i know if the oil injection block-off was done? i doubt he did it as the fuel in the tank looks like gas only, but after a year of him having it i don't wanna take any chances. also what is the best 2 stroke oil to use for this boat. thanks!