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What is the Octane rating for a 2009 buick lucerne v6?

The 2009 Buick Lucerne V6 requires a minimum octane rating of 87 (regular). However, using a higher octane fuel (like 89 or 91) won't hurt the engine and may provide slightly better performance in some situations, but it won't significantly increase fuel economy. The owner's manual is the definitive source for this information.