As some of you may know I just bought a powder special and the topend was blown. So in the process of figuring out why it blew up AGAIN (the guy blew it up a few times before I bought it) we decided to check the crank seals. So we had to split the whole bottom end apart and take out the crank to change the seals. The bottom of the crank there was a bit of shavings but nothing too bad from the pistons. When we put it back together I bought this synthetic oil from Canadian tire and it was garunteed for arctic cat snowmobiles, injector safe and mixable and so on. But I remember someone telling me to burn my first tank of oil on normal 2 stroke oil as its thicker and then switch to sythetic? Now I'm not sure what I should've done. We also cleaned the crank with varsole to remove any metal shavings so ONlY synthetic is in there now, and all its burnt its whole life (anything to do with being blown up 3 times?) is arctic cats own synthetic. Also I was told to premix my first few tanks of gas after the topend rebuild but was also told not to because it would screw up the efi injectors? I don't know what to think right about now... theres always 2 stories to every question I ask.