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what is the differance between ester and pag oils fo air conditioners and which one applies to what vehicle?

what is the differance between ester and pag oils fo air conditioners and which one applies to what vehicle?

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As a general rule, ester oils are only currently used with R12 or retrofitted AC systems. PAG, in various viscosities, is the recommended refrigerant oil for most R134a vehicles since the mid-nineties. Consult manufacturer service guides for specific vehicles, especially imports and hybrids, as some compressor manufacturers have very specific requirements. Many companies offer PAG in a "universal" form, or in viscosities of 46, 100, and 150.

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Tom Dayton
JS Auto Supply

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