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Go Back   Hummer Forums by Elcova > Hummer H2 Discussion Forums > General H2 Discussion

 
 
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Old 02-03-2010, 02:45 AM
Easy Ed Easy Ed is offline
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Join Date: Oct 2003
Posts: 1,118
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Default Re: 89 or 93 octane in H2

2005 owners manual
Use regular unleaded gasoline with a posted octane
of 87 or higher. If the octane is less than 87, you may get
a heavy knocking noise when you drive. If this occurs,
use a gasoline rated at 87 octane or higher as soon as
possible. Otherwise, you might damage your engine. A
little pinging noise when you accelerate or drive uphill is
considered normal. This does not indicate a problem
exists or that a higher-octane fuel is necessary. If you are
using 87 octane or higher-octane fuel and hear heavy
knocking, your engine needs service.

Last edited by Easy Ed : 02-03-2010 at 02:48 AM.
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