GMPartsGiant.com offers the wholesale prices for genuine 2009 Cadillac CTS parts. Parts like Automatic Transmission Oil Cooler Pipes 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, 8 Cyl 6.2L. Model Code: 4 DOOR, 4 DOOR RHD, V 4 DOOR.