Fully synthetic ACDelco Air Conditioning Compressor Oils (46 Viscosity) are formulated to provide unsurpassed lubricity, wear protection, and proper miscibility with ozone-friendly refrigerants like R-134a (except for R4 and A6 systems), as well as R-12 in the case of retrofits. Formulated for automotive air conditioning systems, ACDelco Air Conditioning Compressor Oil (46 Viscosity) has excellent chemical, thermal, and hydrolytic stability. It is available in a bottle or cartridge. For professional use only. Not for retail sale.