MAC Posted May 24, 2015 Report Share Posted May 24, 2015 I know that oil addatives are generally looked upon as snake oil, but I must say that Marvel Mystery Oil cleared up engine knocking that was present when first staring. It only took a couple hundred miles. I put in two quarts (25% of oil capacity) and so far I like the results. Actually, a little more than 25% since oil capacity is 7.5 quarts. Marvel has been around since 1923. I currently have 263K plus miles on the engine and it runs good--except I need to fix a vacuum leak. If the knocking is gone for good it gives me hope that I can go another at least 50K or more. I think I'm going use Marvel from here on out to keep the engine clean. Well...Actually, I hold off on the final verdict until I see whether I end up with leaks. Quote Link to comment Share on other sites More sharing options...
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