EPA 608 Core · Substitute Refrigerants & Oils · Hard
Which oil is primarily used in automotive HFC-134a AC systems?
Answer: D. Polyalkylene glycol (PAG)
- APolyolester (POE)
- BMineral (naphthenic) oil
- CAlkylbenzene (AB)
- DPolyalkylene glycol (PAG)✓ Correct
Why D is right
PAG oil is the standard lubricant for mobile (automotive) HFC-134a systems.
More Core questions
- Which oil was historically the standard for CFC refrigerants?
- What does 'hygroscopic' mean regarding refrigeration oils?
- Can mineral oil be used to retrofit a CFC system to an HFC refrigerant?
- What oil is most commonly used in ternary blends containing HCFCs?
- Which refrigerant is approved as an exempt substitute for new household fridges?
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.