I've read of the virtues of PAG 46 oil for R12 systems. Is anyone using it for the GM/Harrison compressors? (1985 300TD). Most sources say use mineral oil.

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D

GM compressors require PAG 150

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GM/R4 from my info need 500-525 visc mineral oil if using R12 refrigerant. The Pag and Ester oils are mainly for R134A refrigerant. Alot of people use the pag/ester oil in case of converting.

I am using R12 and went with BVA napthetic mineral oil 4 (325 visc). I had used Castrol 525 mineral oil before.

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I've read conflicting information about oils best for GM R4's with R-12.
Some say PAG 150 is compatible & better, and others say stick with Mineral oil.
Does anyone using the PAG 150 for this application have some longevity figures?

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