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Old 01-21-2006, 09:42 PM   #1
magicleo2120
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87 and 89 octane gasoline

can i use 89 on my 87octane car?... i ask is because when my fren puts 89 we fight over it like xrazy... and also i ask is because when i was putting chevron 87 in my car the other day. i saw a this little asian guy (I have nothing w/asian's) putting 91 into his scion xb. he was all stock looking...


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Old 01-21-2006, 10:03 PM   #2
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Your Focus computer is set up to run 87 oct gas. You can run 89 oct, but you will not feel any performance or gas mileage gains. So save yourself some money and stick with the 87. Now if you decide to get a tune and ad some performance parts to your car, the tune may call for a higher oct gas. Alot of performance cars need higher oct gas because of how the computer is set up. I know that the SVT Focus's call for 91 oct gas or higher, and the 87 oct would make them run like garbage. So I would stick with the 87 oct for your car. I would also use some fuel injector cleaner every 300 miles or every oil change. This keep your motor running clean and strong. I hope this helps you out.
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Old 01-21-2006, 10:54 PM   #3
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Re: 87 and 89 octane gasoline

Quote:
Originally posted by magicleo2120
. i saw a this little asian guy (I have nothing w/asian's) putting 91 into his scion xb
Your asking this just because you saw some dude pumping 91 oct on a scion??
I did see some German guy putting 91octane in his BMW the other day
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Old 01-21-2006, 11:03 PM   #4
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Re: Re: 87 and 89 octane gasoline

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Originally posted by 2K5 FOCUS ST
Your asking this just because you saw some dude pumping 91 oct on a scion??
I did see some German guy putting 91octane in his BMW the other day
Uh, maybe he's wondering if the Scion guy knows something he doesn't?
Uh, maybe that a stock Scion doesn't seem very different to him from his car?
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Old 01-21-2006, 11:10 PM   #5
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Re: Re: Re: 87 and 89 octane gasoline

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Originally posted by EricR
Uh, maybe he's wondering if the Scion guy knows something he doesn't?
Uh, maybe that a stock Scion doesn't seem very different to him from his car?
i was just simply asking because i saw that scion guy putting 91 in his car and thought to myself... wow 91 on a scion when it only requires 87 like mine.

thanks!!!
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Old 01-21-2006, 11:30 PM   #6
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Re: Re: Re: Re: 87 and 89 octane gasoline

Quote:
Originally posted by magicleo2120
i was just simply asking because i saw that scion guy putting 91 in his car and thought to myself... wow 91 on a scion when it only requires 87 like mine.

thanks!!!
You would be surprise how many people actually pump higher octane then whats really recommended, some people think their car would benefit from this.
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Old 01-22-2006, 02:36 PM   #7
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i know like my friend for example. her dad told her to use 89 becuase her sister was using 87 onher bmw. figures
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Old 01-23-2006, 11:23 AM   #8
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On a low mileage vehicle higher octane will have no effect.

On higher mileage vehicles it might, as octane requirements for engines generally increase over time due to carbon buildup and deposits in the engine. In the old days it was quite easy to tell when higher octane would help, as you could hear the pinging. Nowadays engine management computers are generally smart enough to detect detonation and retard the spark such that you lose a bit of HP and cannot tell that the octane is lower than the engine wants.

So if you've got 100,000 miles on a Focus, you might get better performance using higher octane than recommended.

Might.
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Old 01-23-2006, 07:27 PM   #9
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agree with penguin on that my sport trac has started to ping on lower octane gas. You can't time it as it is computer controlled. I changed the plugs and wires which didn't help. But when I put 92 in it it stopped and sounded fine it has 92,000 miles on the 4.0 v6
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Old 01-23-2006, 08:27 PM   #10
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"my sport trac has started to ping"

Try some of the "deposit remover" gasoline additive stuff, such as the Gumout or Techron Engine Cleaner that specifies it reduces engine deposits.

It's not magic by any means, but for $4-5 it's worth a shot as I have had some limited success using it on high mileage cars, e.g., on 2 of the 5 I have used it on, it has stopped or significantly reduced the pinging.

If you do try it, let us know if it works for you.

P.S. I have a 1992 Explorer with 196,000 miles on it. I've used a deposit cleaner every 10,000 miles or so. It doesn't ping on Regular 87 Octane gasoline. Of course, right now it is disabled in the driveway as there appears to be a major brake fluid leak on the left side mid-vehicle. I suspect the brake line from the fron to the rear has rusted out and needs replaced. But not until the snow is gone and it warms up a bit.

Last edited by penguin; 01-24-2006 at 09:09 AM.
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