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What type of transmission does a 1984 Oldsmobile delta 88 brougham v8 307 have 3 speed or 4 overdrive and what oil should be used?

A 1984 Oldsmobile Delta 88 Brougham with the 307 V8 most likely had a 3-speed automatic transmission, not a 4-speed with overdrive. Overdrive transmissions weren't common in that era on that type of vehicle.

As for the transmission oil, you should use Dexron II or Dexron III automatic transmission fluid. Check your owner's manual for the exact specification recommended by Oldsmobile for that year and model. Using the incorrect fluid can damage the transmission.