He is being serious, mineral oil, as compared to synthetic. I have a '99 MXZ 600 and i asked the dealer what oil i should use and they told me, that the 600 is not considered a high performance engine, and i'd be throwing $$$$$$ out the window to use synthetic oil. I am using the mineral oil made by Bombardier @ approx $20.00 a gallon.
Your 583 has "power valves", "exhaust valves", or R.A.V.E. valves. There those plastic things just above the exhaust pipes where they come out of the engine. Black plastic with a red adjustment knob. You should clean them once a year.
You can use any oil you want. Certain kinds will make cleaning the RAVE valves easier.
I've used Ski-Doo mineral oil, synthetic blend, and full synthetic before in my sled, and in my cousin's 97 FZ 583. Probably the synthetic blend left the RAVE valves the cleanest. The mineral oil was good, too. The full synthetic didn't burn quite as clean, and was expensive, and smelled terrible. Although we used the full synthetic years ago, and I've heard they have changed their formula since then.
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