Genuine Ford Fluid YN-12-D PAG Refrigerant Compressor Oil - 7 oz. Required in the majority of non-electric A/C systems equipped with R-134a refrigerant Use to replace compressor oil lost by leaks or by replacement of an A/C system part For O.E. and Retrofit A/C Systems equipped with R-134a refrigerant Excellent thermal stability, chemical stability and lubricity High viscosity index and excellent low temperature fluidity