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Pulled the exhaust valves from my 08 D8 with 1300 miles. Previous owner ran Redline since new. Found some carbon on valves, not bad though. However, on my last sled, 07 D7, I ran Poo oil since new, pulled the valves at 2100 miles and found no carbon. What's your opinion between these TWO oils? Am thinking of staying with Polaris oil, cost is the same, at my dealer.