Well, I don't own an XC but whenever I drive on I use the Polairs VES oil in the gold bottle. I would asume that just about any 2 cycle VES oil would work although I would go for some of the higher end stuff.
I ride a 98 XCR 440 SP, and i have always used to the Polaris VES oil as well. I have used AMSOIL in the past with excellent results, but is also expensive. The key to these oils i believe is to prevent sticky valves and does that by burning cleaner. The synthetics have little or no ash and other substances that cause stickiness. I have also never fouled a single plug using the AMSOIL. Coincidence? Maybe. How often do you clean your valves??? 500 miles or less has worked for me.
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