Is MMO ok to use as a pre mix substitute?
 

Im not using MMO nor would I even consider it as a pre-mix oil, but my buddy is hell bent that MMO is good to use as a pre-mix oil.

NO!

MMO is more of a solvent than a lubricant, it more resembles transmission fluid in viscosity and properties and was never originally intended for internal combustion lubrication in rotaries. 2 stroke oil has been time tested and proven to work so why not stick with what works?

Thank you kind sir. Im using Redline Snowmobile Racing 2 Stroke.

The owner that i bought the car from left a new bottle of MMO in my car, but i never use it or touch it, alot people do not advise using on rotary engines.

MMO isn't a substitue for 2-stroke oil. It was never intended to be one, nor is any other fuel additive like Lucas, Lubrigas, or Fuelpower.

2-stroke oil should be API TC, ISO GD, JASO FC, NMMA TCW3 certified, or preferably a combination of certifications.

MMO is a lubricant and not just a solvent.
Most certified 2-stroke oils have a pretty strong solvent dose(20-40%) to help keep everything clean in order to prevent ring sticking and carbon buildup in those 2-cycle engines.

Use the MMO in addition to the 2-stroke, or as an additional lube/cleaner with working oil metering injection.

Comparing anything to ATF is not a valid argument. Most 2-stroke oils ,and 5w20 or 0w20 motor oils, are also similar in viscosity to ATF. So, what something resembles is meaningless whether in viscosity or color.

If anything, Marvel Mystery Oil is very similar to most 2-strokes with a similar(but thinner) recipe of oils, light oils, and distillates.

Use it as a fuel additive or oil additive if you want. Don't use it as a substitute for 2-stroke oil.

well as I recall (there have been dozens of threads on this- some of them detailed enough to even give the break down of the chemicals) anyway as I recall MMO is mostly Mineral spirits and parafin... so not really any sort of a subsitute for a good TCW3 2 stroke oil.

When premixing how much oil should be put in 1 full tank of gas?

You would want to read the mix amounts listed on the side of the bottle of pre-mix/2 stroke.

Normal usage is 200 to 1 (200 parts gas to 1 part 2 stroke), with maximum being 100 to 1. Many people shorten that to 1 oz of premix for every 1 gallon.

If you have not disabled your MOP then 250 to 1 to 300 to 1 would be the recommended range. Or again in shortened range not more than 1/2 oz per gallon.

Too much pre-mix will lead to build up on the spark plugs and rotor faces.

For those who are interested, 1oz. to 1 Gal is a 128:1 ratio