Can you use 87 octane gas for a 2000 Buick Park Avenue ultra?
The owner's manual for your 2000 Buick Park Avenue Ultra will specify the recommended octane rating. While it *might* tolerate 87 octane, using a lower octane than recommended can lead to decreased performance, potential engine knocking (pinging), and long-term engine damage. It's best to check your manual to be certain, and use the recommended octane fuel.