Maintenance Engineers have been dealing with the problems of varnish formation for so long that it seems hard to believe when they are told that one type of lubricant cannot form varnish. However, PolyAlklene Glycols (PAG’s) shut down every chemical mechanism that is known to form varnish in other types of lubricants. 1. PAG’s reduce in molecular weight as they oxidize. The oxidation of PAG’s result in the fracturing of the polymer and the formation of low molecular weight ethers and glycols. This happens at such a slow rate under recommended operational temperatures that changes in the average molecular weight of PAG’s over time are undetectable. It is the growth in molecular weight that cr
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