UView’s MoistureGuard Technology prolongs the overall shelf life of products and decreases the ability of Ester Oils to form acids, which can harm A/C Systems. Two sizes available: No. 488016P Universal PAG Oil with MoistureGuard Technology and eBOOST 16oz (480ml) Bottle; and No. 488016E – Universal ESTER Oil with MoistureGuard Technology & eBOOST 16oz (480ml) Bottle.