what does pag oil do
That being said letâs take a look at PAG and ESTER oils. PAG is actually an acronym for Polyalkylene Glycol, and it is a synthetic oil used in A/C systems to lubricate the compressor. Most all newer model cars use PAG as the lubricant in the A/C system. When people refer to PAG oil they typically refer to it in the following terms: PAG 46, PAG 100, or PAG 150. The numbers represent the viscosity of the lubricant just as â10W-30â or â10W-40â represent the viscosity of motor oil.