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Re: What oil to use to lube A/C o-rings
Posted to HVAC Forum on 5/22/2006 1 Reply

I do believe mineral oil is ok.

Ester is out of the question as well as pag because of moisture and then corrosion.

I have been using Dura Sil 1000 for years since I switched from mineral oil for R12.

The engineering is good and the results I have seen o... Login to read more.

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