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I was reading the forum before xmas and someone suggested using "marvel mystery oil" in the gas and in the oil. I ordered some and I need to know how much in the oil (I have a starter that sometimes does not turn over the engine and just spins) I have talked about this with some gear head friends and they all have heard of this stuff but nobody had any ideas about how much to add to the gas or oil - I am open for suggestions. Thanks



by the way - 1982 interstate
 

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MMO is well discussed on the web. Some people swear by it and others swear at it, but make up your own mind. Amounts to use are;

4 - 6oz to 10 gallons of gas. In engine oil, about 100 miles before an oil change, drain out 1 pint of old oil and replace with 1 pint of MMO. Add half a pint to the new oil when changing. I never used it at every change, only every second one. Don't use it at all in fully synthetic oil as that oil doesn't form sludge or gum in the first place.
The MSDS sheet shows three ingredients in MMO: chlorinated hydrocarbons, mineral spirits, amd napthenic hydrocarbons. The chlorinated hydrocarbons would help break up carbon deposits. Mineral spirits help dissolve varnish (oxidized oil). I suppose napthenic hydrocarbons would also act like a solvent. I always suspected that prolonged use of MMO weakend the oil seals and eventually you get leaks. I wouldn't bother using it in the fuel at all as carbon isn't an issue these days. Different story in our parents time (MMO has been around as long as Count Dracula), but I would reccomend using it in your GL1100. I did for a long time and when I changed oil the old oil looked as clean as the new oil!
 

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Budegans figures are right. I've used MMO years ago. If you put it into petrol you need to get the amount right or you will have a smoky engine. MMO is almost like WD40, great for freeing up rusted or seized parts. I never liked using it all the time, every second or third oil change was enough for me.
 

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Thanks Martin! :)
 

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Ya those are right figures!

I stay conservative with it!

I've used it for over 25 years, it's great stuff!

I put 2 ounces in a tank full (4.5 gal)

And 1/2 pint in a couple hundred miles before an oil change and then a 1/2 pint with the new oil!
 

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I run Amsoil in the engine so don't use MMO in the oil but do add it to every second or third tank. About 2oz. My bike has fuel injection so I kind of think(hope?) it might do the injectors some good.
 

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For cleaning, I would suggest an half-cup of Ford or non-friction ATF in the oil. Cleans valves, pistons, starter bendixs' and all internal engine parts. (If you're using 20W 50 oil, you can add about 1.5 US cups to 5 quarts of oil.) And it's a lot cheaper than Mystery oil which will cause yourgas to smoke.
 

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SailorW wrote:
For cleaning, I would suggest an half-cup of Ford or non-friction ATF in the oil. Cleans valves, pistons, starter bendixs' and all internal engine parts. (If you're using 20W 50 oil, you can add about 1.5 US cups to 5 quarts of oil.) And it's a lot cheaper than Mystery oil which will cause yourgas to smoke.
Many Opel cars still use a mix of oil and ATF and it does keep the internals clean.
 

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Gosh, I remember Marvel Mystery Oil. My dad used it in all his cars, bikes and pick-ups over the years. I thought it was long discontinued but apparently not.
 
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