I accidentally put 88 octane gas with 15% ethanol in my tank, instead of 87%/10%. My dealer says I need to have the tank drained, removed, washed, then put back on. Is this just a way to make $250 or would one tank of this 88%/15% really hurt my engine?

They told you this for E15 (which is 85% gas)? Not E85 (15% gas), right? I wouldn’t give it a second thought.

Yeah they said that for getting E15. They said it was like “oil and water” :face_with_monocle:

I question the ability of any mechanic that would make such a nonsense claim, and I’d avoid them. Edit - at best, they completely misunderstood you and thought you were talking about E85.

[image] hannahqb_330: Every Subaru in town told me I need to clean the lines and take out the engine. E15 will clean the fuel lines just as well as E10. You must have has a bad phone connection, the engine is not removed to drain the fuel tank. I have drained E85 from customers vehicles and …

[image] hannahqb_330: I accidentally did the same thing to my Subaru Impreza only a half a tank of e15. What’s the other half? If it was E10, then your tank has E12.5 now. (The oil and water comment is completely bogus.) That’s not ideal, but chances are that won’t cause any real issues. As m…

Don’t worry about it, since it was only 1/2 tank, fill it the rest of the way with non-ethanol gas. More expensive than 87 octane E10, but cheaper ( in my area) than E10 premium.

And if you can’t find non-ethanol gas, I still wouldn’t worry about it, just fill it up with E10 in that case.

Hmmmm? A year old post. I wonder if the OP used up that tank of gas by now? Tester

We’re responding to a new post.

No, they resurrected an old post rather than starting a new thread.

2011 Subaru Forester — accidentally added 15% ethanol gas

Maintenance/Repairs

circuitsmith July 26, 2021, 10:52pm 36

If the check engine light doesn’t come on you don’t have anything to worry about, not even topping off early.

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2011 Subaru Forester — accidentally added 15% ethanol gas

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