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Federal law requires that gasoline octane ratings are displayed on the fuel pumps.

V6 gasoline vehicles:

Do not use fuels with an octane rating lower than 87 AKI, as severe engine damage may occur.


Do not use leaded fuels, fuels with lead substitutes, e.g., manganese-based or fuel additives, as these may adversely affect the emissions control systems and may affect warranty coverage.

The use premium unleaded gasoline with a minimum octane rating of 91 AKI (Anti-Knock Index) is recommended. Using the correct fuel specification contributes to increased performance, fuel economy, and driveability.

If premium unleaded fuel is not available, use unleaded fuel with a lower octane rating, down to a minimum of 87 AKI. Using lower octane-rated fuel may reduce engine performance, increase fuel consumption, and can cause an audible engine knock, and other driveability problems.

Consult a retailer/authorized repairer if a heavy persistent engine knock is detected, even if using fuel to the recommended octane rating. Also consult a retailer/authorized repairer, if an engine knock is detected, while holding a steady speed on level roads. Failure to do so is misuse of the vehicle, which is not covered by the vehicle's warranty.


An occasional light engine knock, when accelerating or climbing hills, is acceptable.