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What type of fluid goes in a 1951 Oldsmobile automatic transmission?

A 1951 Oldsmobile automatic transmission used Type A ATF (Automatic Transmission Fluid). However, it's crucial to understand that this is a very old specification, and finding Type A ATF today is extremely difficult, if not impossible. You'll almost certainly need to use a modern ATF that's compatible with older transmissions.

Do not simply use any modern ATF. Consulting a reputable specialist in classic car restoration or a mechanic experienced with older Oldsmobiles is strongly recommended. They can advise on the best compatible modern ATF, and possibly even recommend additives. Using the wrong fluid can severely damage the transmission.