Is it ok to use RON98 for my W202 - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 06-16-2014, 04:06 AM Thread Starter
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Is it ok to use RON98 for my W202

On the fuel filler flap of my W202 C240 (M112 V6) it says RON 95. But the gasoline they sell under RON 95 name in our country is nothing more than garbage and is hardly 93. I thought I could use 98 as that one is imported from EU. But I'm not sure if that's safe. Could that damage the engine?
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post #2 of 4 (permalink) Old 06-16-2014, 06:40 AM
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Octane rating - Wikipedia, the free encyclopedia

"Anti-Knock Index (AKI)

In most countries, including Australia, New Zealand and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States, Brazil, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).

Difference between RON and AKI

Because of the 8 to 10 point difference noted above, the octane rating shown in Canada and the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel. This difference is known as the fuel's sensitivity, and is not typically published for those countries that use the Anti-Knock Index labelling system."
There is a chart on that link that shows RON95 fuels are generally AKI 91 here in the US. So about any 91 octane or better fuel in the US will meet the RON 95 requirement.
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post #3 of 4 (permalink) Old 06-16-2014, 08:21 AM
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There is nothing wrong with filling up with higher octane, unless you go to high elevations.
I drove to ski resorts at 9000' with high octane and never noticed negative effects, but the science tells otherwise.

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post #4 of 4 (permalink) Old 06-16-2014, 11:19 AM
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Why not fill the tank with 50% low octane, and the rest with 98


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