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Old 01-06-2013, 11:06 AM   #1
tristaur's Avatar
Join Date: Feb 2012
Location: Tucson
Posts: 13
Octane and Performance

I have a 98 TJ with the 2.5L and i have 109,000 miles. I typically used 87 or 89 octane fuel and recently started using the higher octane fuel and my jeep seems a little more peppy. Anyone else have this experience or comment?

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Old 01-06-2013, 11:08 AM   #2
UnlimitedLJ04's Avatar
Join Date: Aug 2010
Posts: 7,317
if you understand exactly what an octane rating is, you'll understand why your experience is all placebo, and why lower octane is all you should put in your tank.

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Old 01-06-2013, 11:14 AM   #3
Knows a couple things...

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Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
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X2 on the placebo effect. Octane is not something that adds power, octane is added to gasoline to slow down how fast it burns & make it harder to ignite so it can't self-ignite itself prematurely before the spark ignites it.

In fact, running a higher octane than your engine was designed for could actually harm performance or even leave more unburned deposits behind.

Only higher performance engines with high-compression (higher than our Jeep engines have) levels benefit from/require higher amounts of octane.
Remember that having a different opinion doesn't also require one to be a jerk when expressing it.

When you have a choice, buy American.

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Old 01-06-2013, 01:08 PM   #4
Old Dogger's Avatar
Join Date: May 2012
Location: Phoenix, Rattlesnake Country
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You are wasting your money!!!!!!!!!!!!!!
The oil Company's will love you..........
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Old 01-06-2013, 01:15 PM   #5
SeVeReDiStOrTiOn's Avatar
Join Date: May 2012
Location: CA
Posts: 768
There are some newer vehicles that have different timing tables for low and high octane fuel but your jeep isn't one of them. Save your money.
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