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I use Mobil 10W-30 Full synthetic (not the extended performance) and a K&N Gold oil filter. I ride it hard so I change my oil at the regular interval of 2800K. Thats cuz I also drive very long distance home too every other week too. I like it, good oil.
I've taken the car to our auto mechanic.Troythinks that a valve seal has simply gone bad. He doesn't think my choice of motor oil would have made much of adifferance but did say he wasn't a fan of extended oil change intervalsBTW.