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Can you use 87 octane gas on a 2000 Lincoln LS?

The 2000 Lincoln LS owner's manual will specify the recommended octane rating. While it *might* tolerate 87 octane, it's highly recommended to use the octane rating specified in the manual. Using a lower octane than recommended can lead to decreased performance, potential engine knocking (pinging), and long-term engine damage. Check your manual – it's the definitive answer.