Is it okay to put 93 Octane Gas in a 1995 Oldsmobile Cutlass Supreme with 3.1 liter V6 engine?

Yes, it's perfectly fine to put 93 octane gas in a 1995 Oldsmobile Cutlass Supreme with a 3.1L V6 engine. While the owner's manual likely recommends regular (87 octane), using higher octane fuel won't harm the engine. The engine's computer will simply adjust the timing accordingly. You might not see any performance gains, but you won't cause any damage. The only downside is the increased cost.