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Qt mystery oil. Add to gasoline for better gas mileage. Lubricates like lead. Prevents sticking rings and valves. Improves compression. Reduces cylinder wear. Will not harm catalytic converters. Also add to crankcase to extend life of oil. Extra protection in hot and cold weather. Add 8 oz. per tank of gas or 20% of total crankcase capacity at oil changes. Perfect for marine engines. Quart
Marvel Mystery Oil
Pros: This product has been around for a long, long time. I've used it myself for at least 32 years. I overhauled an old chevy 235 six cylinder engine, and used this product for top cylinder lubrication from day one after I put the engine back together. It ran like a sewing machine! I mostly added it to my fuel, but it enhances engine oil too. A person could experiment with it on just about anything, and find another good use for it.
Cons: I don't know of any "cons" for this product. As long as you don't expect things from it that it was never realistically designed for, you probably won't find any cons either. Oops, I found one, You can't buy a quart for a dollar!
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“This product has been around for a long, long time. I've used it myself for at least 32 years. I overhauled an old chevy ...”— newtech2140 3/2/2013