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I am curious about the possible negative effects of running my 73 240z with SU carbs on 10% ethanol. All stations are required in the state of Washington to add 10%. I'm concerned about rubber and gaskets.

Posted by dcaverre on


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Malcolm Campbell

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Hi, This should not be a problem, remember Ethanol was used prior to petrol and the 10% will not cause any rubber failures I used a 50% petrol/Ethanol mixture when racing for 10+ years without any problems. Please leave me feedback thanks, Malcolm Campbell.

Posted on Sep 19, 2017


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The best fuel you can use on your vehicle is any octane that contains at max 10% ethanol.

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A 10% blend of ethanol and gasoline will not harm any engine or fuel system component. However, the ethanol has a cleaning effect that will remove rust and other junk from the fuel system. This necessitates frequent fuel filter changes until the fuel system is cleaned out.

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I hope this helps you out,


Also if you would not mind taking a moment out of your day and rating my solution it would be greatly appreciated. Thanks in advance!

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