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What grade of gas is required in a Cadillac?

The required grade of gasoline for a Cadillac depends entirely on the specific model and year of the Cadillac. The owner's manual will always specify the recommended fuel grade. Generally, many Cadillacs recommend using regular unleaded (87 octane), but some higher-performance models may require premium unleaded (91 octane or higher). Using a lower octane than recommended can reduce performance and potentially damage the engine.