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Re: What oil to use to lube A/C o-rings
Posted to HVAC Forum on 6/19/2006 1 Reply

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Ford Type mineral oil for O-rings and threads. A few ounces of mineral oil in R-4 compressors and PAG-46 in most R-134a systems. PAG 100 and 150 in a few and Ester in R-12 systems converted to R-134a ... Login to read more.

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