EPA 608 Core · Substitute Refrigerants & Oils · Medium
Can mineral oil be used to retrofit a CFC system to an HFC refrigerant?
Answer: C. No, HFCs will not mix with mineral oil.
- AYes, it is perfectly compatible.
- BYes, if an acid scavenger is added.
- CNo, HFCs will not mix with mineral oil.✓ Correct
- DNo, unless it is a mobile AC system.
Why C is right
HFCs require synthetic oils like POE; they are immiscible with traditional mineral oil.
More Core questions
- What oil is most commonly used in ternary blends containing HCFCs?
- Which refrigerant is approved as an exempt substitute for new household fridges?
- Which type of oil is most commonly used with HFC refrigerants?
- Which oil is primarily used in automotive HFC-134a AC systems?
- Which oil was historically the standard for CFC refrigerants?
Go deeper with the study guide A2L Refrigerants and the R-410A Transition: A Tech’s Guide, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.