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Old 03-12-2003, 12:43 PM
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Join Date: Feb 2003
Location: Miami, Fl
Posts: 23
Question Octane rating -anti-knock or less carbon deposit?

I was under the inpression that Octane rating was a measure for the amount of ANTI-KNOCK solution in the gas. I read in the Owner's manual for my E-320 (W210) that it is recommended the Owner never uses anything less than 91 Octane because it will cause Carbon deposit in your engine.... Here is my question:

Does higher Octane also reduce the likelihood of carbon-deposits??

Thanks beforehand
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Old 03-12-2003, 02:26 PM
Ali Al-Chalabi's Avatar
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Join Date: Nov 2000
Location: Knoxville, TN
Posts: 1,837
If you use lower octane fuel, the engine will retard the timing to prevent knocking.
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record
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Old 03-12-2003, 04:15 PM
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There is no such thing as an anti-knock solution in gasoline. The anti-knock properties are acheived with the use of a slightly different refining process and a different blends of the gasoline components.
Using lower octane gasoline can (only can, not necessarily) promote some carbon deposits because of the retarded ignition but it would take a lot of mileage to be able to notice a major difference.
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