GMPartsGiant.com offers the wholesale prices for genuine 2021 Buick Enclave AWD parts. Parts like Automatic Transmission Oil Pump are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.6L. Model Code: BASE EXTENDED 4 DOOR SUV, PREMIUM 1 EXTENDED 4 DOOR SUV, PREMIUM 2 EXTENDED 4 DOOR SUV.