TSI Supercool P100-128 PAG 100-Viscosity Oil - 1 Gallon 100 Viscosity high performance synthetic PAG for R134a systems provides excellent resistance to moisture Anti-Wear Agents and Friction Modifiers enhance compressor and A/C system efficiency while reducing compressor wear rates which extends compressor life Anti-Oxidants protect system against formation of sludge and other deposits which can shorten compressor life and reduce system efficiency Meets OEM Performance Specifications