Which statement is true regarding R134a refrigerant?

R134a refrigerant, which is widely used in automotive air conditioning systems, has specific characteristics that differentiate it from its predecessor, R12. One important aspect to consider is the type of lubricants that are compatible with R134a. R12 systems commonly use mineral oil for lubrication, which does not mix well with R134a. Instead, R134a requires the use of PAG (Polyalkylene Glycol) oil or POE (Polyol Ester) oil for proper lubrication and system operation. This necessity for a different type of lubricant means that the refrigerant also needs a different desiccant than R12 to manage moisture within the system effectively.

This switch in lubricants and desiccants is critical for maintaining system performance and avoiding potential damage. Understanding this compatibility is essential for technicians working with refrigerant retrofits or repairs, ensuring the longevity and reliability of the air conditioning system.