64Nail Posted July 18, 2019 Share Posted July 18, 2019 I’ve been using Marvel Mystery Oil in my 47 Plymouth for years. A little in the fuel and a quart in the engine with the regular oil really helps keep the old components running smoothly. Now Im wondering if anyone is using it in their 1963-5 Rivieras 1 Link to comment Share on other sites More sharing options...
Dales90 Posted July 18, 2019 Share Posted July 18, 2019 Dont know about MMO, but back in the day used STP, down the carb and in the crankcase. Link to comment Share on other sites More sharing options...
Hearse Posted July 18, 2019 Share Posted July 18, 2019 A little bit of it is in the crankcase of the 64 Riviera now, a little in the tank. I've used it for years on everything from marine to go carts . 1 Link to comment Share on other sites More sharing options...
TexRiv_63 Posted July 18, 2019 Share Posted July 18, 2019 If I still had my Riv I would be using it. I have a 63 Olds Starfire that had an intermittent noisy lifter, started putting 6 ounces of MMO in with oil change and it has never come back. Link to comment Share on other sites More sharing options...
rapom Posted July 18, 2019 Share Posted July 18, 2019 I never used it in the oil, but I will put about 4oz in with the fuel now and then. Link to comment Share on other sites More sharing options...
KongaMan Posted July 18, 2019 Share Posted July 18, 2019 Dunno that there's a reason to use it like Frank's RedHot, but it appears to be helpful in certain situations (e.g. a quart in the crankcase of an older engine a few hundred miles before an oil change). Link to comment Share on other sites More sharing options...
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