Marvel Mystery Oil

[ArlyA]

To see how stabil or marvel mystery oil interacts with gasoline take a clear glass pint jar, fill it 3/4 full of gasoline than add either an ounce of Stabil or marvel mystery oil and see if you see any floating on the top of the gasoline. My guess is both will intermix with the gasoline.

I quit using stabil after it made chunks in my small engines fuel tank and it wouldn't run. Now use seafoam.

 

[Jstpssng]

I wouldn’t think adding MMO to engine oil would be very good for any engine oil. Add it to fuel yes but I want my engine oil thick especially in old engines

It looks like atf

Haven't used it in years but back in 1986 I bought a 1969 Chevy pick-up with a 305 engine that had a bad valve tapping noise. Bought the truck for nearly nothing with the belief that I would have to do a valve job at the very least. A mechanic friend convinced me to pour MMO directly into the carb while the truck was running. It smoked like someone had set off a couple of military smoke grenades but ran quiet and smooth afterward. Wish I had that truck today.

How much MMO are people using to stabilize 5 gallons of gas?

Years ago I had a with an F150 with a 300 that had lifters sticking so badly that it sounded like a sewing machine going down the road. One day I had it towed in because a lifter had collapsed. I dumped some MMO into the crankcase ran it hard for about 100 miles, then changed the oil. I got another 100k miles out of the engine without another problem.

Since then I've done the same thing with other trucks except that I've switched to using ATF with similar success. I don't normally use additives but if the engine is junk anyways, I have nothing to lose.

 

[ttman4]

Since then I've done the same thing with other trucks except that I've switched to using ATF with similar success.

How you using the ATF? In oil or fuel or gas or what/how?

 

[JRH02]

A mechanic friend convinced me to pour MMO directly into the carb while the truck was running. It smoked like someone had set off a couple of military smoke grenades but ran quiet and smooth afterward.

I've done that too and it worked. I was told to shut the engine down immediately after drizzling the MMO into the carb and let it set at least a day. There were no skeeters around for a bunch of hours

 

[Jstpssng]

How you using the ATF? In oil or fuel or gas or what/how?

Dump about a quart into the crankcase, run it about 100 miles and change the oil. It may work, it may not. It may blow up the engine although I haven't had that happen yet. I've only done it when the engine was pushing the blues and I had nothing to lose.

 

[EBGwd59]

I do not normally go for snake oil products and considered MMO as one BUT it is definitely not snake oil. I now add it to every storage can of gas I have. I use Eagle Safety cans for my gas storage, they seal tight and have no worries about leakage during transport that happened occasionally with plastic containers. I keep about 50 gallons of gas on hand for the tractors, mowers, etc. and before I started adding MMO the gas would go bad. I had used MMO in the past for sticky valves as mentioned and since I had some on the shelf, that was getting pretty long in the tooth, decided to add it to the storage cans. Mainly to get rid of it. Best move I have ever made, have not had a can of ethanol laced stuff they call gas go bad since. I NEVER, at the end of season/use, run the carbs dry and leave the tanks full and even after some of the engines set for a year with the tank of gas they fire easily and run smoothly.

As an added bonus, that surprised me, I added some to the tank of my old 1992 GMC K3500 flatbed with a 7.4L for some valve noise and noticed that the gas mileage seemed like it was up. I keep meticulous records on all my vehicles pertaining to every drop of gas or oil added to them and after several tests running tanks of gas with and without MMO added it happened every time that the mileage was up by 1 to 2 miles per gallon with the MMO added. Doesn't sound like much but going from 10 mpg to just over 12 on that truck makes a worthwhile difference to me.

How much do you add? Capful? At what rate?

 

[ratpie]

I've done that too and it worked. I was told to shut the engine down immediately after drizzling the MMO into the carb and let it set at least a day. There were no skeeters around for a bunch of hours

my dad taught me that trick, when i was a kid. 2 capfulls of ATF in the carb and run for 20 minitues. cleans all the carbon deposits off valves and piston tops.

 

[Gator6x4]

my dad taught me that trick, when i was a kid. 2 capfulls of ATF in the carb and run for 20 minitues. cleans all the carbon deposits off valves and piston tops.

I have seen water used in the same manner for the same purpose.

 

[Restoring110]

I have a Yamaha Rhino that is burns oil, which they are notorious for. I decided to try a little MMO in both the gas tank and the crankcase as well. So far it seems to be working and not using as much oil or smoking as it was before.

 

[John0829]

How much do you add? Capful? At what rate?

Add 2 oz. to each 5 gallon can.