What to Do If Your Manual Says 87 Octane or Higher
Understanding fuel octane ratings and their importance for your vehicle's performance.
Understanding Octane Ratings
Octane ratings indicate a fuel's ability to resist engine knocking or pinging during combustion. Higher octane fuels can withstand greater compression before igniting, which is crucial for high-performance engines. If your manual specifies 87 octane or higher, it means your vehicle is designed to run efficiently on regular unleaded gasoline with an octane rating of 87 or higher.
Using the Recommended Octane
Using the recommended octane fuel is important for maintaining optimal engine performance and fuel efficiency. If your manual states 87 octane, using this fuel should provide the best balance of power and efficiency for your vehicle. However, using a higher octane fuel than recommended typically does not provide additional benefits unless your engine is designed for it.
What If You Use Lower Octane Fuel?
If you accidentally use a lower octane fuel than recommended, your vehicle may experience knocking, which can lead to engine damage over time. If this happens, it is advisable to switch back to the recommended octane as soon as possible.
What Isn't Confirmed
Specific performance differences between octane ratings can vary by vehicle and driving conditions, and the impact of using higher or lower octane fuel than recommended can depend on various factors such as engine design and driving habits.
Where to Verify
For the most accurate information regarding fuel requirements for your specific vehicle, refer to your owner's manual. Additionally, you can consult with your vehicle manufacturer or a certified mechanic for personalized advice.
Answered from our EPA fuel data and general, well-established fuel facts in response to real driver questions. Anything car-specific — especially whether premium is required vs recommended — is in your owner's manual, so we point you there instead of guessing.
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EPA/DOE FuelEconomy.gov data retrieved 2026-10-25.