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Does a 1997 Buick Riviera with 3.8 liter supercharged engine have to run on premium fuel?

Yes, the 1997 Buick Riviera with the supercharged 3.8L engine requires premium fuel. The supercharger significantly increases the compression ratio, making it crucial to use fuel with a higher octane rating to prevent engine damage from detonation (knocking). The owner's manual would explicitly state this requirement.