Quote:
Originally Posted by jeff5may
GM switched to PAG 150 oil and R134a in like 93 or 94. Later (this century), they switched to thin PAG oil, like 40 wt or so.
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You are probably correct . Our 1991 Caprice is R-12 . Or , it was , that is the car I am interested in converting .
The 1996 Lumina is R-134a .
God bless
Wyr