Gasoline Octane
Use regular unleaded gasoline with a posted octane rating of 87 or higher. If the octane rating is less than 87, you may notice an audible knocking noise when you drive, commonly referred to as spark knock. If this occurs, use a gasoline rated at 87 octane or higher as soon as possible.
If you are using gasoline rated at 87 octane or higher and you hear heavy knocking, your engine needs service.
See also:
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The vehicle may have an automatic dimming inside
rearview mirror with OnStar® and/or a compass
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the headlamps of the vehicle behind you. The dim ...
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when tested under controlled conditions on a specified government test course. For
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