09-02-2024, 11:53 PM

SS-TA

Senior Member

Join Date: Oct 2006

Posts: 228

The R-12 systems from the factory came with 525 Viscosity Refrigerant oil (mineral oil). The Last Part number I had (probably 30 years old) for a quart from GM was 12301108 (AC Delco 15-117. You should replace all the O-rings as HWYSTR455 has suggested wit nitrile rubber (Buna-N), they are usually colored green.

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