Octane Rating -l Gasoline Octane Levels | Esso and Mobil
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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
  • Synergy Supreme 91 octane
  • Synergy 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?

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‡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

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