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Octane Rating

Octane rating describes a gasoline fuel's resistance to engine knock under defined test conditions. The number is not a general fuel-quality score.

Quick answer

Octane rating describes a gasoline fuel's resistance to engine knock under defined test conditions. The number is not a general fuel-quality score.

What to know

Vehicle manufacturers specify the fuel grade an engine needs. Using a higher number than required does not automatically improve every vehicle. What to check Check the owner's manual, pump label, local octane-rating system, and any additive directions before changing fuel treatment.

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