GMPartsGiant.com offers the wholesale prices for genuine 2018 Buick Encore 2WD 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: 4 Cyl 1.4L. Model Code: CX 4 DOOR SPORT UTILITY, CXL 4 DOOR SPORT UTILITY.