RED TEK OilCharge12 A/C Universal Refrigeration Oil (4 oz. can) Operation: Easy to use. Installs in minutes. Can be used with R134a or R12. Lower Cost: Refrigerant oils do not have to be changed or replaced. Compatibility: Compatible with most common refrigeration materials and lubricants including R134a, R12, metal components, mineral and synthetic PAG lubricants, seals, gaskets, hoses, compressors, and o-rings. Environment: Helps environment by reducing oil changes and extending equipment life. Safety: Safe and easy to use.