Engine Refrigeration (Supplementary) USCG Question #155 (Set 3)

Alkylbenzene ISO 32 cSt synthetic refrigerant oil is miscible and suitable to use with which of the following refrigerants?

Official USCG Answer & Rule Citation

Correct Answer: Option C — R-22

Alkylbenzene synthetic lubricants provide excellent chemical stability, oil return, and complete miscibility when utilized with HCFC refrigerants such as R-22 across standard operating temperatures.

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