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Okay to use ethanol gas in a 4 stroke? #14031296 06/14/21 09:38 AM
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SenkoSam Offline OP
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I just got a 2.5hp 4-stroke motor for my small jon boat. Ethanol gas damaged my 90 hp 2-stroke over many years. Can the same thing happen to the 2.5hp, 4-stroke kicker?
Hopefully E10 (10% ethanol) won't hurt the motor seeing as how no gas station near me sells non-ethanol gas.

Last edited by SenkoSam; 06/14/21 10:28 AM.
Re: Okay to use ethanol gas in a 4 stroke? [Re: SenkoSam] #14031436 06/14/21 01:34 PM
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All I use, 89

Re: Okay to use ethanol gas in a 4 stroke? [Re: SenkoSam] #14031504 06/14/21 02:25 PM
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I would waste my money on non ethanol gas it as 4% in it


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Re: Okay to use ethanol gas in a 4 stroke? [Re: SenkoSam] #14031750 06/14/21 06:15 PM
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Ethanol don't damage motors, neglect does.

Re: Okay to use ethanol gas in a 4 stroke? [Re: SenkoSam] #14032093 06/14/21 10:51 PM
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I don't think E10 is a problem for engines designed to run on it. I think the main thing with E10 is not to let it sit. I have easy access to ethanol free and only use it in my 2 cycle premix for lawn equipment. I used it in the boat for a while because of the 95 gallon tank. I don't any more. The Optimax does fine on E10.


2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
Re: Okay to use ethanol gas in a 4 stroke? [Re: SenkoSam] #14032219 06/15/21 12:56 AM
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SenkoSam Offline OP
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Update:
I called Mercury outboard and this is what I was told:
1. make sure 10% ethanol is max. Higher than that (E15)- no good. Mobil and Exxon always mix no more than 10% ethanol (E10).
2. use Stabil gas treatment to help with water/ gas separation due to ethanol
3. as long as Stabil or some other gas treatment is used, using stored gas shouldn't be a problem - even through the winter
4. a higher octane than regular (81) is not always good or advantageous

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