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General Motors Engine Codes: BUICK

Engine Code
151" 4 Cyl. (VIN 5)  Y4, Y6, Y9, A3, AU, AS, AT
173" V6 (VIN 7)  CNJ, CNF, CNW, CSB, CNX, CNL, CSC
231" V6 (VIN A)  EX, EY, EZ, EL, OA, OB, OC, EN, OX, OY, ED, EP, EA, EB, EK, OW, EC, EM, OV
231" V6 (VIN 3)  EU, EW, ER, EE, OS, EH, EJ
252" V6 (VIN 4)  MF
265" V8 (VIN S)  XH, XR
301" V8 (VIN W)  XT, XW, X3
350" V8 (VIN R)  UAF, UAD, UAS, UAT
350" V8 (VIN X)  MB, MU, MT
350" V8 (VIN N)  VCD, VBN, VBT, VBM, VBS, VBU, VCH