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10/40 oil

  1. ATV Oil, Lubrication & Filter
    My book on my 2002 500 HO says 10/40 oil. Now when I look to buy it, it's had to find 10/40 Polaris oil, most are 50 wt. Do i need to keep looking and stick with 10/40 as when new and always used. And I have read here some use Mobile 1. So do I need mineral oils or syn oil ? Sorry i'm...
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