When I switched to Amsoil it was because of the reports of it keeping the exhaust valves cleaner than other oils. Through my observation it performed well but not better than BRP Synth Blend. XPS Synthetic, coincidentally, has been one of the worst in my observation. It leaves a gummy build up on the valves, but this doesn't mean it's a bad oil, I'll run BRP oil any day of the week. Amsoil Interceptor is a good oil, if you can get it easily, run it. To me it's al about availability and cost with these two. When snowmobiling, almost every fuel stop has the Big 4's oils (Yam, Pol, Ski, AC) so getting BRP oil is a breeze. I will be trying out Mystik Full Synth this winter so next spring I'll have something to report on. I hear and read a lot of good stuff about Mystik. Levi Levalle's crew uses all their lubes and swears by them. They claim to have improved holeshots from the use of Mystik lubes. Take that for what it's worth. But there are reports available similar to the Amsoil report for Mystic and it tests out very well. Plus, I've read a lot on DooTalk.com about positive real world reviews of guys using Mystik which carries some weight with me. Gonna try it. If it works well, it's almost half the price of BRP and Amsoil and I can go down to Farm and Fleet and get it any time.
Anyone else using Mystik full synthetic 2 stroke oil?