What gas is recommended for a 1994 Cadillac Fleetwood?
A 1994 Cadillac Fleetwood would require unleaded gasoline. The specific octane rating recommended will depend on the engine it has. Check your owner's manual for the precise recommendation, but typically it would be either regular (87 octane) or mid-grade (89 octane). Using a higher octane than recommended won't hurt, but it's a waste of money. Using a lower octane than recommended *can* cause knocking (pinging) and damage the engine over time.