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100 octane 10% ethanol gasoline

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I need an answer on running fuel with 10% ethanol? Will this hurt the engine? I have a 2002 C4S coupe and it requires 93 octane but in the U.S. at the pump where I live the highest is 91, but there is a station that sells 100 octane 10% ethanol fuel and I was going to blend this with the 91 to make the minimum 93 octane. I was actually going to blend to 95. My only question is the Ethanol going to be a problem and should I not worry about it? I know in some states and cities that 10% ethanol is mandatory certain times of the year.

Thanks in advance for your help.


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  • Admin

Did you check your Owners Manual?

Fuels containing alcohol and ether

Some areas of the U.S. require oxygenated fuels during certain portions of the year.

Oxygenated fuels are fuels which contain alcohols (such as methanol or ethanol) or ether (such as MTBE).

Under normal conditions, the amount of these compounds in the fuel will not affect driveability.

You may use oxygenated fuels in your Porsche, provided the octane requirements for your vehicle are met.

We recommend, however, to change to a different fuel or station if any of the following problems occur with your vehicle:

- Deterioration of driveability and performance.

- Substantially reduced fuel economy.

- Vapor lock and non-start problems, especially at high altitude or at high temperature.

- Engine malfunction or stalling.

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