We have been running Mystic Full Synthetic 2 stroke oil in all 4 tripple cyl sleds this year. That is a combined milage of over 2,000 miles to date. The ole Phazer is till running out the old smoky Yamalube. Glad to report, the Mystic is working fine. Minimal smoke, not completely smokeless but very clean. The belly pans are not stained at all. Only time, you can actually see the smoke is upon "cold" start up and while idleing at night, dead calm. I am extreamly happy, plus the cost is exceptional, half the cost of Klotz and 2/3 the cost of Yamahalube. Now, if they could only add the Klotz fragrance. lol Al