Locate an automotive paint supply store that has a “color camera” used to match paint colors. Take off your gas filler door (easiest part to remove with the body color you want to match) and let them make a pint for you. Sometimes they will only make a quart? The result will match your body color best after 50 years of age/weathering. The 1962 Oldsmobile Service Manual has the original RM and DuPont paint codes in the back, however I have not been able to find anyone that can mix paint from these old codes. Brand will not make much difference. My Jetfire station wagon above is Garnet Mist.