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Re: RPO Codes
Just about everything you find on the web concerning GM RPO codes leaves alot to be desired. I can see a bunch of late model GM RPO codes missing especially engine and autotransaxle right off the top of my head.
L36 - Normally aspirated SII 3800 V6 engine
MN3 - 4T65E 4 speed autotransaxle
M15 - 4T65E 4 speed autotransaxle
MN7 - 4T65E-HD 4 speed autotransaxle
LG8 - SFI 3100 V6 engine (used in '99-'05 Century)
On '97 and up Buick Regal/Century the SPID label is located on the back of the trunk lid.
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