General question, What grade of gas do you use? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-12-2009, 10:08 AM   #1
Jeeper
 
islandmonkey's Avatar
 
Join Date: Jul 2009
Location: GA
Posts: 258
General question, What grade of gas do you use?

I have been using 89 octane since I got my Jeep a month ago. Is it ok? Do I have to use higher octane?


thank you

__________________
2000 Wrangler, with tires,steering wheel, horn, gas tank, head lights
islandmonkey is offline   Quote Quick Reply
Old 08-12-2009, 10:20 AM   #2
Jeeper
 
jwm1986's Avatar
 
Join Date: Dec 2008
Location: Evansville, IN
Posts: 1,024
No sir. Low grade is the best thing for a stock to mildly modified wrangler motor. Unless you are specifically tuned to use the higher grade.

__________________
2000 Jeep Wrangler Sport
4.0L / 5spd
jwm1986 is offline   Quote Quick Reply
Old 08-12-2009, 10:56 AM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
You've been wasting your $$$ running 89 octane. All octane does is to help the gas resist premature detonation (pinging) from engine compression so if your engine compression isn't high enough (it isn't) to require 89, run 87. In fact the higher the octane, the harder it is for the gasoline to ignite and the slower it ignites. Running too high of an octane can even leave unburned deposits behind and the engine often won't even run as well.

Higher octane fuel has no more energy content than lower octane fuel does and with today'd modern major brand gasolines, you don't get more cleaning additives with higher octanes either.

So there's zero benefit to have been running 89 octane in an engine that is running properly and designed for 87 octane... and there may be drawbacks as well.

The gasoline manufacturers have much of the population bamboozled on octane and reap extra profits from those who unknowingly use a higher than necessary octane in the mistaken thought it helps their engine run better. It doesn't.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-12-2009, 10:59 AM   #4
Jeeper
 
G-Pur's Avatar
 
Join Date: Sep 2008
Location: Lowell, MA
Posts: 1,645
Thanks for the info Jerry, that's really good to know.
__________________
Check us out at NorthShoreJeeps.com

G-Pur is offline   Quote Quick Reply
Old 08-12-2009, 11:01 AM   #5
Jeeper
 
05GT-O.C.D.'s Avatar
 
Join Date: Sep 2008
Posts: 1,415
87 anything else is a complete waste. 89 isn't 'cleaner' as people seem to think it is. See JB's post above which is spot on.
__________________
When my time comes, mix my ashes with gunpowder encased in brass, point me towards murderer's and pedophile's and let me fly.

(: ˇ ɹǝʌo ǝɯ 11oɹ ...sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
05GT-O.C.D. is offline   Quote Quick Reply
Old 08-12-2009, 11:06 AM   #6
Jeeper
 
meyers's Avatar
 
Join Date: Apr 2009
Location: Dover, New Hampshire
Posts: 738
You mean I am wasting my money buying 108 octane at the airport? I do have a air intake and a chip off ebay so that does increase my HP like 40%
meyers is offline   Quote Quick Reply
Old 08-12-2009, 11:08 AM   #7
Jeeper
 
jwm1986's Avatar
 
Join Date: Dec 2008
Location: Evansville, IN
Posts: 1,024
Quote:
Originally Posted by meyers View Post
You mean I am wasting my money buying 108 octane at the airport? I do have a air intake and a chip off ebay so that does increase my HP like 40%
You def need it then!
__________________
2000 Jeep Wrangler Sport
4.0L / 5spd
jwm1986 is offline   Quote Quick Reply
Old 08-12-2009, 12:06 PM   #8
Jeeper

WF Supporting Member
 
joemd60's Avatar
 
Join Date: Mar 2009
Location: MA.
Posts: 1,613
When my jeep goes in for the axle seal, I am getting the motor checked as well. If I put 87 octane rather 89, it runs worse and pings much more.
joemd60 is offline   Quote Quick Reply
Old 08-12-2009, 12:18 PM   #9
Jeeper
 
djwilbanks's Avatar
 
Join Date: Aug 2009
Location: NE Arkansas
Posts: 62
I run 87 in any vehicle I drive unless it requires (not recommends) a higher octane fuel. I also don't go for that piss in a bottle octane booster stuff.
djwilbanks is offline   Quote Quick Reply
Old 08-12-2009, 12:34 PM   #10
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
Quote:
Originally Posted by joemd60 View Post
If I put 87 octane rather 89, it runs worse and pings much more.
Your engine has a problem then, perhaps it is loaded with carbon deposits in the combustion chambers which will raise engine compression. Also, the carbon build-up can glow after the combustion stroke which can then prematurely ignite the air fuel mixture causing pinging.

One last thing to keep in mind... driving an engine too conservatively and never accelerating hard to high rpms can allow carbon deposits to build up. If this happens, it can normally be cured inexpensively or even free. The first thing to try is to drive it VERY aggressively over a few weeks in an attempt to blow the carbon deposits out. Hard acceleration to high rpms in other words. Revving the engine repeatedly to do the same thing can also be done in the driveway but the neighbors usually disapprove of that.

After that, the water technique discussed in the recent thread here works very well to get rid of carbon deposits.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Old 08-12-2009, 12:56 PM   #11
Sponsoring Vendor
 
Join Date: May 2009
Posts: 4,612
Quote:
Originally Posted by Jerry Bransford View Post
The first thing to try is to drive it VERY aggressively over a few weeks in an attempt to blow the carbon deposits out. Hard acceleration to high rpms in other words.
We use to call that an "Italian Tuneup," back when I was more into cheap little sports cars. Maybe now that Fiat owns Jeep....
Geoff@Bestop is offline   Quote Quick Reply
Old 08-12-2009, 12:58 PM   #12
Jeeper

WF Supporting Member
 
joemd60's Avatar
 
Join Date: Mar 2009
Location: MA.
Posts: 1,613
Quote:
Originally Posted by Jerry Bransford View Post
Your engine has a problem then, perhaps it is loaded with carbon deposits in the combustion chambers which will raise engine compression. Also, the carbon build-up can glow after the combustion stroke which can then prematurely ignite the air fuel mixture causing pinging.

One last thing to keep in mind... driving an engine too conservatively and never accelerating hard to high rpms can allow carbon deposits to build up. If this happens, it can normally be cured inexpensively or even free. The first thing to try is to drive it VERY aggressively over a few weeks in an attempt to blow the carbon deposits out. Hard acceleration to high rpms in other words. Revving the engine repeatedly to do the same thing can also be done in the driveway but the neighbors usually disapprove of that.

After that, the water technique discussed in the recent thread here works very well to get rid of carbon deposits.
Thanks Jerry, I need fuel so I will try your method. But nobody can accuse me of not being aggressive on the accelerator.
joemd60 is offline   Quote Quick Reply
Old 08-12-2009, 01:15 PM   #13
that's what she said

WF Supporting Member
 
jgano23's Avatar
 
Join Date: Oct 2008
Location: \m/-_-\m/
Posts: 16,482
Send a message via AIM to jgano23 Send a message via Yahoo to jgano23
i use 87 octane b/c at $2.48 a gallon it's all i can afford. although it is better than the $4.00/ gal that is was last year.
jgano23 is offline   Quote Quick Reply
Old 08-12-2009, 01:49 PM   #14
Jeeper

WF Supporting Member
 
joemd60's Avatar
 
Join Date: Mar 2009
Location: MA.
Posts: 1,613
I am curious and cannot seem to find the water technique thread, Jerry do you think you could lead me to that? Thanks
joemd60 is offline   Quote Quick Reply
Old 08-12-2009, 01:50 PM   #15
Jeeper
 
KBR97's Avatar
 
Join Date: May 2008
Posts: 5,112
I run 110...



haha I wish. I love the smell of burning race fuel..
KBR97 is offline   Quote Quick Reply
Old 08-12-2009, 02:09 PM   #16
Jeeper
 
Jeepn13's Avatar
 
Join Date: Aug 2009
Location: Pittsburgh, PA
Posts: 88
My first Jeep was a 95 and after the first few fill ups of 87 I noticed that the valves were pinging. I called the previous owner and they stated that all they ever used was 89. So appearantly the motor got used to 89 and with the lower octane it was not running as smooth. But if yours runs fine on 87, save your money!!!!
Jeepn13 is offline   Quote Quick Reply
Old 08-12-2009, 02:19 PM   #17
Jeeper
 
mrcarcrazy's Avatar
 
Join Date: Jul 2009
Location: Midland/Odessa, TX
Posts: 3,771
BG 44k will also clean out the Carbon...and allow you to run the proper fuel.

Also avoiding cheap gas doesn't hurt. ( i personally like chevron/texaco, and Shell). due to ripping a motor apart, and finding everything as it should be after using those fuels exclusively....same might have happened with Walmart gas, but I doubt it.
mrcarcrazy is offline   Quote Quick Reply
Old 08-12-2009, 04:45 PM   #18
Jeeper
 
islandmonkey's Avatar
 
Join Date: Jul 2009
Location: GA
Posts: 258
There are several threads in this forum that will tell and prove you those stuff is junk. waste of $$

sorry

Quote:
Originally Posted by meyers View Post
You mean I am wasting my money buying 108 octane at the airport? I do have a air intake and a chip off ebay so that does increase my HP like 40%
__________________
2000 Wrangler, with tires,steering wheel, horn, gas tank, head lights
islandmonkey is offline   Quote Quick Reply
Old 08-12-2009, 04:52 PM   #19
Jeeper
 
05GT-O.C.D.'s Avatar
 
Join Date: Sep 2008
Posts: 1,415
^lol, somebody missed the sarcasm.
__________________
When my time comes, mix my ashes with gunpowder encased in brass, point me towards murderer's and pedophile's and let me fly.

(: ˇ ɹǝʌo ǝɯ 11oɹ ...sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
05GT-O.C.D. is offline   Quote Quick Reply
Old 08-12-2009, 05:25 PM   #20
Jeeper
 
93yjsplash's Avatar
 
Join Date: Jun 2009
Location: Corpus Christi/Falfurrias
Posts: 241
Quote:
Originally Posted by KBR97 View Post
I love the smell of burning race fuel..
x2
__________________
Photobucket YJ Page
93yjsplash is offline   Quote Quick Reply
Old 08-12-2009, 06:04 PM   #21
IITYWTMWYBMAB

WF Supporting Member
::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 10,151
Images: 5
87 for me.. I even ran 87 when I had the Hemi's. Though with that engine I did notice about a 1mpg difference with 91 vs 87. Also for those who missed it, one of the cable news shows I think ran a story how tankers from various companies will fill up a a fuel depot and take the same gas to different stations. Its all the same folks.
__________________
79.96.85.00.01.97.00.97.93.97.95.94
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
4Jeepn is offline   Quote Quick Reply
Old 08-12-2009, 07:27 PM   #22
Jeeper
 
coolbreeze's Avatar
 
Join Date: Jul 2009
Location: Redding, Ca
Posts: 860
Use what the manual calls for grade wise, however there are brands rated Top Tier. If you are curious, google top tier gasoline.
__________________
2004 Black X 4.0, auto, 3.73's, soft top 31-10.5-15 Toyo A/T's on 8" Ultra 175's, 2" Teraflex BB.
coolbreeze is offline   Quote Quick Reply
Old 08-12-2009, 10:43 PM   #23
Jeeper
 
Jeepzcb09's Avatar
 
Join Date: Jun 2009
Location: springfield,OH
Posts: 714
I run 87 on mine as with all my vehicles,and they all run fine
Jeepzcb09 is offline   Quote Quick Reply
Old 08-13-2009, 11:00 AM   #24
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 32,374
Images: 2
Quote:
Originally Posted by joemd60 View Post
I am curious and cannot seem to find the water technique thread, Jerry do you think you could lead me to that? Thanks
I can't find it either. Basically it's nothing more than slowly (!) trickling 12-16 oz. of plain water into your throttle body while the engine is running with the rpms held up a tad (1500 or so) so the engine won't stall. The key is doing it slowly so it takes a couple minutes to drain the 12-16 ounce container of water. Dumping it in all at once would be a death sentence for the engine so maintain good control of the water container.

Aircraft engine mechanics noticed how clean their bomber engines were internally during WWII that used water injection for more power so that got this technique started.

__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
General question about brush guards, bumpers, tail light protectors w8lifter21 JK General Discussion Forum 3 05-15-2009 12:47 PM
General brake question... dj_chizzle General Jeep Discussion 6 07-15-2007 06:45 PM
Oil grade question catlovererika TJ General Discussion Forum 6 07-05-2007 10:59 AM
General Re-Gearing Question gcdcpakmbs TJ Tech Forum 14 05-24-2007 12:09 AM
general tire question ruckus TJ General Discussion Forum 8 12-04-2006 12:13 PM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 07:14 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC