Final answer:
Polyol esters are the synthetic lubricants used with ternary blends containing HCFCs due to their compatibility and efficient lubrication properties.
Step-by-step explanation:
The synthetic lubricant commonly used with ternary blends containing HCFCs (Hydrochlorofluorocarbons) is polyol esters. These esters are formulated to be compatible with the refrigerant blends and are known for their excellent lubrication properties as well as thermal and chemical stability, which are crucial in the high-stress environments of refrigeration systems. They help to ensure that the refrigeration systems operate efficiently and have a longer service life. Polyol esters have largely replaced traditional lubricants such as mineral oils and alkylbenzenes in systems with more environmentally friendly refrigerants that do not deplete the ozone layer as CFCs did.