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  • Hey everyone. Going to do some server maint/upgrades tonight (Fri 4/16) starting about 10pm CDT. The site will be down... until its back up again.

I started this thread to list common RPO codes from the Service Parts Identification Label that everyone always asks about, like axle ratios, engines, etc. I do not have all of them right now, just the ones that are in my Oldsmobile FSM from 1985. If you think I have left something out, post it here for the benefit of all. I am asking for this to be a sticky because it would be very helpful to everyone.
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