OE Viscosity Synthetic PAG Oil for Mobile A/C Systems Contains Fluorescent Leak Detection Dye, Saving Time over Existing Methods of Dye Injection FJC PAG 46 Oil with UV dye can be used in R-134a mobile A/C systems requiring 46 centistokes viscosity PAG oil. As Recommended by OE and Compressor Manufacturers For Use with R-134a Only Can Be Detected Using any UV Light Made in the USA ATTENTION: A partial charge of PAG Oil with Fluorescent Leak Detection Dye will not provide enough dye for proper fluorescing. Only a full system charge during normal service will provide maximum fluorescing for the mobile A/C System. A partial charge may be added to a system which already contains dye