What octane to use for 1991-1996 Buick roadmaster?

For the 1991-1996 Buick Roadmaster, it is recommended to use regular unleaded gasoline with an octane rating of 87. This engine is designed to run efficiently on this fuel type, providing optimal performance without the need for higher octane gasoline. Using premium fuel is generally unnecessary and may not yield any significant benefits in terms of power or fuel efficiency. Always consult the owner's manual for specific recommendations.