It also keeps delicate fillets, such as salmon, from sticking to you BBQ grill. Adds a unique smokey flavor that really says “This meat was cooked behind the hangar”.
Here’s a nice little technical overview:
Quote:
That Marvel-ous Mystery Oil
by Robert Parker
Back in the late 1940s and early 1950s, at military air bases there were 55-gallon barrels labeled MMO (Marvel Mystery Oil). I forget the MIL spec number.... We had charts that told us how many gallons of MMO to put in per tank of fuel.
72 octane is the highest grade of gasoline that can be manufactured without [additives].
80/87 has 0.50 ml TEL [tetra-ethyl lead] per gallon and is dyed RED
91/96 2.00 ml TEL per gallon BLUE
100LL 2.00 ml TEL per gallon BLUE
100/130 3.00 ml TEL per gallon GREEN
115/145 4.60 ml TEL per gallon PURPLE
The amount of TEL in the higher grade fuels has increased the lead build up and fouling of spark plugs, along with valve erosion incidents, reported on some lower compression engines.
You know when you pull a magneto check at the runup area after a considerable taxi to get there, and you are running straight 100LL. You have a RPM drop that is excessive, and run the engine up to a higher RPM for a few seconds and then recheck gives a normal drop.
Why does this happen? There is a bromide chemical in 100LL that is supposed to keep the TEL vaporized and the excess pushed out the exhaust, and this bromide has to be at a certain temperature to work correctly. This temperature can only be achieved in our small engines at 1100 to 1200 RPM. How many of us taxi at this RPM? (If you answered, I do, how often do you have to change your brake pads?)
The automotive gasoline option. There there are two STCs on the market for mo-gas, EAA and Petersen. (I use Petersen's. If you have a question and call, Petersen has an answer for you. EAA has an answer, after 5 different people and the fifth one says let me check and I will get back with you. Sometime they do, and other times that's the last you hear.) Petersen's STC allows for mixing of av-gas and mo-gas. You can put mo-gas in the tank 75% (TEL 0.002 ml) and 25% av-gas (100LL at 2.00 ml TEL) and you have the same 0.50 ml TEL that 80/87 had.
Another way is to run about three tanks of mo-gas and the fourth is a tank of av-gas (100LL) Either of these work OK. That fourth tank however, you will still have the spark plug fouling syndrome.
The TCP/Marvel Mystery Oil option: These are most likely about the same thing, with small changes in the recipe, so as not to infringe on another's copyright. Both are high in detergents to do the cleaning job. Neither should be used for the first time on a high time engine; about half TBO or less should be the cut-off time, for first use.
IN OIL SYSTEM
Use one pint Marvel Mystery Oil about 5 hours before oil change. If screen type system, be sure to clean screen. Then, in the new oil, install one-half pint MMO. This cleans the carbon and sludge collected in the engine passages and crevices and hydraulic lifters, and stores it in the bottom of the oil kidney. Some will make it to the screen, but either place it will be removed at oil change.
IN THE FUEL SYSTEM
Use the directions on the back for amount to put in the fuel per gallon of fuel (4 to 6 oz. per 10 gallons of fuel). MMO goes through the carburetor as a droplet, broken up like the fuel. When it enters the combustion chamber and the gasoline ignites, it is vaporized and soaks into the carbon buildup on cumbustion chamber walls, valve guides, around the valve stem, and on the spark plug. It soaks into the carbon and eventually loosens it up and it goes out the exhaust system.
Now you know how it works, I will neither recommend or not recommend the procedure. Like Fox News says,"I report and you decide". I do know it will help when lifters start to be lazy and not do their job. When valves are beginning to stick, it will free then up. Some people swear by it, some people swear at it, but results is what really tells the tale.
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