PAO-68 instead of PAG-100?

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PAO-68 instead of PAG-100?

Postby jmcdoakes » Fri Jun 21, 2013 10:16 pm

I've been reading about the benefits of using PAO oil instead of PAG in R134a systems, in particular that it does not absorb moisture. I'm working on a vehicle where everything except the evaporator is being replaced (and that will be flushed out). The aftermarket compressor specifies to use PAG-100 oil, but I'm tempted by the PAO 68 "universal" oil that I see for sale in various places, including That seems to be the viscosity that is most available, supposed to replace any PAG oil? Hmmm... Has anyone here used this stuff with a compressor designed for PAG-100? What were the results?

Here's an interesting PAO vs. PAG video:

An obvious concern is violating the compressor warranty using an oil other than that specified by the manufacturer, particularly since the viscosity is different.
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