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Read our primer articles on Grease Guns and Oil Sight Glasses.

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good question both are used mixed together and seperately. I never have heard a good reason for either other than PAG is better for compressing certain Hydrocarbons I think since it will not mix in them.

Otherwsie both give LONG >7,000 hours operation time with little or no sludge or Coke buildup.

Esters maygive better cooling due to inherent lubricity from the ester that the pure PAG will not have so perhaps for cooler running a Ester would be better.
thanks for the info Bruce381.

Badnewsbare, I've read the article in machinery lubrication before and do agree to a certain extend. However, I was told that PAG in general are not really a good lubricant except for it's better heat transfer and water solubility properties.

As I'm in contact with ester based products more, I do believe for air compressor ester are still a better option. If you're using an IR screw comp, changing to a PAG may/would reduce the discharge temp due to it's design.

Anyway, above is just my personal opinion.
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