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To accomplish what exactly? MMO is good in the fuel system for sure. But if you were to put both in the crankcase, the MMO won't clean as well as ARX.
If you're looking to clean heavy engine deposits out of your engine, one or two pints of MMO will accomplish this. ARX may accomplish this after several treatments. To say that MMO will not clean your engine as sufficiently as ARX demonstrates that you have never used MMO. Not saying that either one is better, but MMO is definitely stronger and faster working.
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Long Time User Of Competitive Product
Tries Auto-Rx
Another of Frank's cut and paste jobs. No surprise here. Good job, buddy. What's next, another FAQ re-post?
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I keep reading that MMO "works", "works as advertised", or "produced satisfactory results". I have no idea what any of those phrases mean.
You're joking right?
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Could someone post something that they have measured to warrant such incredibly strong statements. I am most curious about what can be known or concluded.
Use the search feature.
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I will even accept visual observations. I find it difficult to use feelings (even my own) as evidence of anything.
Here's how it usually works.
I pull off a valve cover and notice sludge and/or varnish. Add a pint or two of MMO and let it run for about 500 to a thousand miles then change the oil. Pull valve covers back off and presto chango sludge and varnish are missing. With very little variance this is a procedure I've done upwards of thirty times and the end result is always the same. If the initial bout of MMO treatment did not clear out everything to my satisfaction I repeat the procedure once more until everything is clear. I've never had to do a third treatment of MMO cleaning nor have I ever had to run "maintenance" doses to get my engine in the shape I want it to be in for the duration of my ownership.
Added to fuel, it stabilizes gas for at least a three month period. Anything longer and I use Stabil. Not saying MMO wouldn't accomplish what Stabil does but I've never tried it, and I know firsthand that Stabil works for at least two years.
As a winterizer: supposedly MMO protects against hard starts if added to the gas tank. I don't have an opinion either way with that.
As a fuel system cleaner: it works. As well as any other Gas treatment out there, FWIW. If you have water in your gas tank, it treats that as well.
As a parts cleaner: Excellent degreaser.
As a lubricant: As good as WD-40.
I use it to clean gasket mating surfaces.
I run it through the air intake to clean out that system. Not as effective as Seafoam or GM Top Engine Cleaner. S
As a combustion chamber soak: VERY EFFECTIVE. Soiled and dirty combustion chambers are spot free after a soak. Very popular in the Saturn community.
I have personally seen MMO free stuck rings and lifters. I can honestly say that two quarts left to sit overnight in my motorcycle broke loose my seized engine.
These are all things I've seen MMO accomplish with my own eyes. Some use it in the transmission like ARX, but personally I wouldn't add an additive to my transmissions if you put a gun to my head.