Purolator may refer to: Organizations Purolator Inc., a Canadian courier company Purolator International, its American subsidiary Purolator Filters, an American automotive filter manufacturer (former corporate parent of the courier company) Racing Purolator 500, former name of a NASCAR race at Pocono Raceway from 1974 to 1976 now the Explore the Pocono Mountains 350 Purolator 500, former name of a NASCAR race at Atlanta Motor Speedway from 1994 to 1996 now the Quaker State 400 (Atlanta)