Octane Rating -l Gasoline Octane Levels | Esso and Mobil
×
Menu Search this website
This website is not compatible with Internet Explorer. Please use another browser such as Chrome, Edge or Safari for a better experience.
All website features may not be available based upon your cookie consent elections. Click here to update settings.
Fuels splash octane

Octane ratings

Understanding octane ratings.

About octane ratings

Octane rating is a measure of a fuel's ability to resist ‘knock’. The octane requirement of an engine varies with compression ratio, geometrical and mechanical considerations and operating conditions. The higher the octane number the greater the fuel’s resistance to knocking or pinging during combustion.

The octane ratings of Synergy™ gasoline

  • Synergy Regular 87 octane
  • Synergy Extra 89 octane
  • Esso Supreme 91 octane
  • Esso Supreme+ 93 octane

The right octane level for your vehicle

The recommended octane level for most vehicles is usually octane 87, but be sure to check your owner’s manual. Some car models have high-compression engines, which are designed to utilize octane levels of 89, 91 or higher. Ordinarily, your vehicle won’t benefit from using an octane higher than your owner's manual recommends. But if your engine knocks or pings at the recommended octane level, you may need a higher octane gasoline to prevent knocking.

Have a question about octane ratings?

View our FAQs

   

  • Quality fuels to get you where you’re going

    Discover what steps we take to ensure the quality of our fuels.

    Learn more
  • Our fuel types, gasoline, diesel and octane ratings

    The right fuel for your vehicle

    Get more out of your engine, and your journey, with Synergy™ gasoline.

    Learn more
  • Tips to help you improve fuel efficiency

    Get more out of every trip

    Explore our comprehensive list of tips to help you improve fuel efficiency and get more out of every trip.

    Learn more
  • Synergy Fuel Technology Logo Canada English

    Synergy™ gasoline

    Learn about our Synergy gasoline, powered by 7 key ingredients and engineered to help improve fuel economy.†

    Learn more

‡Improvements, such as fuel economy, are based on Synergy-branded gasoline, where and when available, compared to gasoline meeting minimum Canadian government detergency standards. Actual benefits will vary depending on factors such as vehicle type, driving style, and gasoline previously used. Concentration and availability of the 7 Key Ingredients may vary based upon factors beyond our control, including supply disruptions

Esso is a trademark of Imperial Oil Limited. Imperial Oil, licensee.

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise. Imperial Oil, licensee.