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mr502go -> RE: Synthetic Oils (5/10/2008 10:34:17 AM)
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quote:
ORIGINAL: iskandar taib It's not whether an oil is "synthetic" or not that allows it to mix with methanol. Its whether the "oil" happens to be soluble in methanol or not. Most synthetic oils are not. What we use in glow fuel are known as Polyalkylene Glycols (PAGs), mainly made by Union Carbide (now part of Dow Chemicals). This family of chemicals is actually more related to antifreeze than to other oils. They are soluble in methanol because they have -OH groups in the molecule. Same thing is true of Castor Oil - it is the only vegetable oil (other than, I think, soybean oil) that has OH groups in the fatty acid chains. Incidentally, years ago (in the 1970s) Castrol used to make something called "MSSR" which was a synthetic gear oil (probably PAG based) that was usable in glow fuel. With this in mind, would automotive A/C compressor "PAG" oil work. It's typically used in R-134 systems. I never considered that stuff. May work well as an after run oil for YS engines. I know the old R-12 used Mineral oil, and the two oils aren't compatible. Thanks for the background, very informative!!
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