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does it REALLY need 89 octane?

Old 09-25-2008, 02:10 PM
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Default does it REALLY need 89 octane?

so they say it requires 89 octane? is this correct?(I have not taken delivery on my R/T yet) anyone out there run 87??? any issues? anyone tried 87/89/super? can you tell any difference? or is this just for overall engine health?(lol)
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Old 09-25-2008, 02:20 PM
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Default RE: does it REALLY need 89 octane?

If you don't mind experiencing knock and possible engine failure, which will be detectable during tear down so no warranty, then run that regular gas. Come on man you got a muscle car now you worried about a few pennies for gas?[:'(]

SRT8's must run 91..
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Old 09-25-2008, 04:18 PM
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Default RE: does it REALLY need 89 octane?

well it's not really that....obviously if 100 people chimed in and said 87 works great and they cant tell any differences, I'd be a fool to pay for 89.....but 89 is not always availible(sold out...up north in hickville) so it was basically just the thought of, if I HAVE to use 87....is it gonna be a mistake....
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Old 09-25-2008, 04:31 PM
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Default RE: does it REALLY need 89 octane?

The knock sensor will cut timing as it detects knock. So it will run on 87 but your performance will be less than optimal. Manufacturer suggests 89 as the ideal octain. 87 will work but performance will be less.
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Old 09-25-2008, 08:27 PM
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Default RE: does it REALLY need 89 octane?

Well... you can use 87 or 89 Octane, but why not just put 91 Octane and get most out of your engine performance. I may use 89 Octane on a long road trip or if that is the only one I can choose. nothing but 91 Octane for me, cost about 10-cent more, why not. [8D]
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Old 09-30-2008, 05:35 PM
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Default RE: does it REALLY need 89 octane?

I have HAD to use 87 in my 300C once and it did not like it at all. In fact, I worried about it and ended up adding 91 as soon as I could to "even out" what was left in my tank. This could have been unique to my car, but my advice would be to stick to 89 and know you can get away w/ 87 if you need to.
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Old 10-01-2008, 08:56 AM
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Default RE: does it REALLY need 89 octane?

its really not worth it; if you have to, dont run the car hard


if you had a forced induction high compression ratio engine i'd tell you no bueno, but I think you probably got a little more leeway on your engine

but I guarantee you if you don't notice a difference in the performance then your not paying close enough attention to your car.

nothing good will come of this.

If I could I'd be putting 92 in my car!
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Old 10-02-2008, 11:26 AM
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Default RE: does it REALLY need 89 octane?

I'm running 89 in my R/T and you could put 87, but you shouldn't put 91 in the 5.7




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Old 10-02-2008, 02:11 PM
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Default RE: does it REALLY need 89 octane?

The $2 or $4 you save at pump is so misleading.
I get 10% more miles on tank of expensive gas in Caravan.
So now I am even.

I filled my Dads van for him.He asked me where I got gas because he got 40 more miles on a tank.
I told him I put super in it.

It all comes out in the end.

Like synthetic oil...you pay twice as much but it lasts twice as long.
You can go spend the extra time you save looking for re-badged Shelbys.... [sm=badbadbad.gif]
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Old 10-02-2008, 03:55 PM
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Default RE: does it REALLY need 89 octane?

I've heard both stories, some people including my mechanic say that Super will give you better mileage and others say it burns away faster.
Some say that 87 is more wasteful since the fuel isn't as efficient as Super.

I wish we some solid proof and tests so we know who to believe.
I guess if you run the mid-grade 89 then your basses are covered.........hehe

keep in mind new engines are designed for certain octanes tho.
Old cars would benefit from 92, but using it in the Chally 5.7 might be worthless.



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