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Message: <blockquote data-quote="lesgawlik" data-source="post: 47630" data-attributes="member: 4115"><p>Pilots have sworn by MMO for decades. It can be added to gas or engine oil. It's supposed to be stoddard solvent, which is or was a dry cleaning solvent. It has been reported to free stuck valves, clean oil passages and clean carburetors and injectors. It has been used so long and so often in high displacement air-cooled aircraft engines that it is almost certain not to cause harm. Benefits are anecdotal, but enough to make me think there's something to it. It is not an approved additive, so I couldn't say that I used it even if I did. The only caution I can think of is the same one they say about changing from regular oil to synthetic oil -- go slow. In the early days of synthetic oil, people were cautioned to change over to synthetic oil one quart at time because it was so efficient a detergent that sheets of sludge in dirty engines would come loose and clog oil passages. If you have a high time engine which you suspect to be sludged-up, add a little and change the oil. Next time add a little more and change the oil, etc.</p></blockquote><p></p>