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Original post by: Mel ,


I can't tell why it doesn't show up in the sample but I had the same problem did oil sampling every 20,000  and wipe lobes right of the cam and never show any sign of a problem from the lab. I don't think the syn oil had anything do with your problem.  I don't run syn engine oil any more couldn't justify the cost and seen no improvement in fuel mileage or longevity of the engine.