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87 Octane, woops.


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Pulled up to the station the other day with about 40 miles till empty. (Around 3.5 gallons left in the tank of 93 octane). It was hot, and I was in a bit of a rush so I told the guy fill it up, 87. Mind you, I drove my wrangler earlier that day so thats maybe why I had 87 stuck in my head. After about 30 seconds or so I realized what I had done, jumped out of the car and stopped the pump. It put about 5.8 gallons of regular 87 octane gas in. I could not believe what I did. I then filled it the rest of the way with 93 and only put in about 4.3 gallons of that. My tank was in between 3/4 and full. Figuring the combo I had in the tank, I was thinking it was around 89 octane? But still, our cars stock require 91 octane MINIMUM.

 

Driving, I could definitely feel the difference. The car doesn't pull like it normally does and I'm sure it is NOT happy with the fuel in there since I have it dyno tuned for 93 octane. (Along with all of my other engine mods). I decided to just let her idle in my driveway for a while. Then took her for a cruise taking it easy. I'm a little below half a tank now, but figure I might as well just keep going till I'm empty and then fill it with 93. I don't want to keep mixing.

 

Anyone ever have this "brain fart"? lol :hammer_self: :doh:

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Anyone ever have this "brain fart"? lol :hammer_self: :doh:

 

 

 

Yeah, been there and done that, fortunately never in one of my cars (LOL). I was in Central America about 20 years ago and had a Toyota Van rental vehicle on military business. I stopped at a little Podunk gas station in the middle of nowhere to get gas. There were two pumps which I assumed to be premium and regular. I put about 5 gallons in the tank and then noticed a diesel smell. The nozzles were the same size and looked similar. It was then I notice I was pumping diesel fuel unknowing. I stopped the pump and filled it the rest of the way with gasoline. It would only run about 25 mph and smoked like World War I four-stack Destroyer lying down a smoke screen. For the next two weeks each time I got it down to about a quarter tank I’d add more gasoline. By the end of the three-week deployment the van would run about 50 mph and only smoked like an old Chevy with no valve stems left.

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I don't think it will hurt it unless there's pinging, would it? Just baby it and keep adding back the 93.

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Make sure your dealer doesn't find out, it will void your warranty. Does your fuel door have the 91+ sticker on it? I'm surprised someone filling it up wouldn't notice it.

 

 

Look at my mod list in my signature. My warranty is LONG gone haha.

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Don't do it. I have, and it screwed the plugs up.

 

 

 

I would never use that stuff. I've heard all kinds of horror stories about octane boosters. I'm almost on empty and will be filling it up with 93 tomorrow!

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Nope, can't say I've ever put the wrong octane in or put gas in my diesels (knocking on wood so I don't do it in the future, either).

 

I don't ever put 93 octane in our SGT. I only put 91 in it. Of course, that's because 91 is the highest pump octane we can put in up at altitude. :D

 

One of these days, I may try 94 octane (or 98 - whatever the low octane race gas is out here) to see how it likes it.

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