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Originally Posted by Floyd
Rotorwrench is the prize winner for today!
With just a wee bit of chemistry background, I am always skeptical of any snake oil type products. However there are a few that are good and have been proven over many decades. One of which is MMO. Think back to the real old days when motor oil was poorly refined (lots of long chain molecules) and cold running conditions ( moisture in the oil) and you got sludge in the bottom and carbon buildup in the top. Fuel from even worse with lots of Sulphur.
MMO is made up of light oil, mineral sprits and versions of dichlorobenzene which is the main solvent which is known for softening carbon deposits and releasing them from metal surfaces. A form of boron is included as a detergent ( think ole timey Borax). The oil of wintergreen (the smell you get from MMO ) is Methyl salicylate and among many uses has properties of a penetrating oil and releasing corrosion on metallic surfaces. Put it all together with a colorful dye and you get a very useful product . A more modern product for today's fuel injection engines and especially DFI engines is the carbon cleaning solvent from Lubrizol which is the material marketed as Techron , a very good product.
MMO is still a good product for many applications. It does work and does no harm.
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That Techron can sometimes free up a resistance type fuel sender after a couple of cans.