GMPartsGiant.com offers the wholesale prices for genuine 2018 Buick Enclave AWD parts. Parts like Engine Assembly-Front Cover & Cooling 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.