If retrofitting a system to use R134a which oil should be used?

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Multiple Choice

If retrofitting a system to use R134a which oil should be used?

Explanation:
When upgrading a system to R134a, you need a lubricant that will mix with and be compatible with that refrigerant. Mineral oil won’t mix with R134a, which can lead to poor lubrication and compressor failure. Ester-based lubricants in the POE family are compatible with R134a and provide proper lubrication across the operating range, making them the standard choice for retrofits. AB oil isn’t a recognized, standard refrigerant lubricant, and PAG oil is used in some automotive applications but isn’t the general retrofit recommendation. So, Polyester POE is the correct choice because it is the compatible lubricant for R134a systems.

When upgrading a system to R134a, you need a lubricant that will mix with and be compatible with that refrigerant. Mineral oil won’t mix with R134a, which can lead to poor lubrication and compressor failure. Ester-based lubricants in the POE family are compatible with R134a and provide proper lubrication across the operating range, making them the standard choice for retrofits. AB oil isn’t a recognized, standard refrigerant lubricant, and PAG oil is used in some automotive applications but isn’t the general retrofit recommendation. So, Polyester POE is the correct choice because it is the compatible lubricant for R134a systems.

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