What type of gas for 1999 Dodge Durango?
A 1999 Dodge Durango could use either regular unleaded gasoline (87 octane) or mid-grade unleaded gasoline (89 octane), depending on the engine. Check your owner's manual for the specific recommendation for your Durango's engine. The fuel type is usually clearly stated there. Using a higher octane fuel than recommended won't hurt, but it won't provide any performance benefit and is a waste of money. Using a lower octane fuel than recommended could lead to engine knocking and potential damage.