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drolston · 10-14-2020, 06:15 PM

It is probably a really good product for old flatheads, with increased zinc for our flat tappet cams, and detergents to prevent sludge build up. But at $9.00 per quart, plus shipping, it is a little expensive. My solution is to use one quart of Valvoline TR1 racing oil for the zinc, and four quarts of any other good oil for the detergent and other additives.

I put about half a pint of MMO in the gas at each refill to keep those valves from sticking. Which they absolutely will do.

10-14-2020, 06:15 PM	#2
drolston Senior Member Join Date: Jun 2014 Location: Williamsburg, VA Posts: 1,627	Re: Marvel Mystery Oil and Marvel Classic Motor Oil It is probably a really good product for old flatheads, with increased zinc for our flat tappet cams, and detergents to prevent sludge build up. But at $9.00 per quart, plus shipping, it is a little expensive. My solution is to use one quart of Valvoline TR1 racing oil for the zinc, and four quarts of any other good oil for the detergent and other additives. I put about half a pint of MMO in the gas at each refill to keep those valves from sticking. Which they absolutely will do.