Universal for All Mobile A/C Applications - eliminates the need to carry different grades or viscosities of a/c lubricants. Top Up or Fill Up - compatible in any ratio with all lubricants. Refrigerant Compatibility - ROC oil is compatible with HCFCs CFCs HFCs HFC blends and HCFC blends. Zero Moisture Absorption - both PAG and ester lubricants can absorb up to 50% of their weight in water that could end up in the A/C system. Low Miscibility - more lubrication stays in the compressor and less travels with the refrigerant reducing the chances of starving the compressor or lubrication especially in the case of refrigerant loss. ROC oil is a highly refined synthetic lubricant with an operating range of -90 degree F to 599 degree F that will not break down over extended use. ROC oil lubricated A/C systems are more efficient with quicker pull down times and lower vent temperatures. Compressors acheive: Lower operating temperature with less noise; reduced load and run times ; improved durability; less H.P. draw. 500 mL bottle.