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Date: Sat, 07 Apr 2007 21:43:21 GMT
From: "Walt Kienzle" <>
Subject: Re: Octane ratings.....what's the truth?

"johannes" <> wrote in message [snip] > In my experience over thousands of miles, the LPT equally benefits from > high octane fuel. Minimising fuel cut outs at maximum power. Reducing flat > spots. The cleaning agents in some quality fuels are also worth having. Agreed. Any car with a knock sensor will likely provide better performance and/or fuel economy when higher octane fuel is used and the engine is at normal operating temperature. The OP pointed out that in his location the price difference among the grades was increasing and was asking what octane is required so as not to damage his engine. Regular fuel meets that requirement "generally speaking". He also was concerned about the 91 RON octane requirement listed in his owners manual (which neglected to inform him that 91 RON is equal to 87 AKI regular grade fuel sold in North America). In North America, the Top Tier initiative ( and government regulations have nearly eliminated the difference in cleaning agents among the various grades of fuel for a particular brand.

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