Which oil type is used when retrofitting to R134a?

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Multiple Choice

Which oil type is used when retrofitting to R134a?

Explanation:
When upgrading a system to use R134a, the lubricant must be compatible with that refrigerant. R134a does not mix well with mineral oil, so using mineral oil can cause poor lubrication, oil return problems, and potential compressor damage. Polyester POE oil is a synthetic ester that is compatible with R134a and remains miscible with it, allowing proper lubrication and circulation with the refrigerant. It also handles moisture and oxidative conditions better in R134a systems. For this reason, the retrofit standard is to use POE oil. The other oils have different compatibility profiles and aren’t the preferred choice for a typical R12-to-R134a retrofit.

When upgrading a system to use R134a, the lubricant must be compatible with that refrigerant. R134a does not mix well with mineral oil, so using mineral oil can cause poor lubrication, oil return problems, and potential compressor damage. Polyester POE oil is a synthetic ester that is compatible with R134a and remains miscible with it, allowing proper lubrication and circulation with the refrigerant. It also handles moisture and oxidative conditions better in R134a systems. For this reason, the retrofit standard is to use POE oil. The other oils have different compatibility profiles and aren’t the preferred choice for a typical R12-to-R134a retrofit.

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