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Old 09-16-2011, 10:28 AM   #1
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Gasoline Question

I have a 2011 Sahara, does it matter which gas I should get? (87, 89, 92)
I normally get 87 on my nissan pathfinder, just wondering if it's ok to go with the same or should I get 89 or 92 when at the gas station.

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Old 09-16-2011, 10:36 AM   #2
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I run 87 in mine all day long with no issues.

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Old 09-16-2011, 11:04 AM   #3
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I've tried using 89 in my 11 JK auto and it didn't seem to make any difference. No more power or MPG.
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Old 09-16-2011, 11:16 AM   #4
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Higher grade gas in an engine that doesn't need it is a waste of money.
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Old 09-16-2011, 11:19 AM   #5
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Your 3.8 is designed to run at optimal performance on 87 octane gasoline. There is no need to run higher.
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Old 09-16-2011, 11:31 AM   #6
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Quote:
Originally Posted by ESP123
Your 3.8 is designed to run at optimal performance on 87 octane gasoline. There is no need to run higher.
Actually higher octane, means slower burn, more power and better millage.. Also burns cleaner so you get less carbon burn/build up on your valves, pistons, and plugs...
so no matter what your "designed" to run on. Dumping a litte super in it once in awhile will do ya some good. But you really don't need to run it all the time.
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Old 09-16-2011, 11:36 AM   #7
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Actually higher octane, means slower burn, more power and better millage.. Also burns cleaner so you get less carbon burn/build up on your valves, pistons, and plugs...
so no matter what your "designed" to run on. Dumping a litte super in it once in awhile will do ya some good. But you really don't need to run it all the time.
False. All of it.

Octane has nothing to do with burn rate, it is only a measure of resistance to ignition. Fuels that do not ignite readily when they are supposed to, such as midgrade or premium in an application that calls for regular, tend to not combust fully which leaves carbon throughout the engine. It does not burn cleaner.

If you want to "clean it out" from time to time use a fuel additive that is meant to do that from a reputable source like BG.
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Old 09-16-2011, 11:39 AM   #8
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Originally Posted by rockhard98 View Post
Actually higher octane, means slower burn, more power and better millage.. Also burns cleaner so you get less carbon burn/build up on your valves, pistons, and plugs...
so no matter what your "designed" to run on. Dumping a litte super in it once in awhile will do ya some good. But you really don't need to run it all the time.
The 3.8 does not benefit from the use of any gasoline higher than 87. This is well known. You will get no greater mileage from burning higher octane gas in your Jeep. You will however burn more gasoline and waste more money. The choice is yours.
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Old 09-16-2011, 11:49 AM   #9
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Related query: I recall someone arguing that higher altitudes warrant using a higher octane gas, but I have no recollection of why that is or whether the view was generally accepted. Anyone have any comments?
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Old 09-16-2011, 11:50 AM   #10
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Sounds like couple people need to read up on combustion chamber! And fuel.
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Old 09-16-2011, 11:51 AM   #11
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Quote:
Originally Posted by Camojeep View Post
I've tried using 89 in my 11 JK auto and it didn't seem to make any difference. No more power or MPG.
Nor should it.
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Old 09-16-2011, 11:55 AM   #12
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Quote:
Originally Posted by oilwell1415 View Post
if you want to "clean it out" from time to time use a fuel additive that is meant to do that from a reputable source like bg.
bg?
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Old 09-16-2011, 12:01 PM   #13
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Related query: I recall someone arguing that higher altitudes warrant using a higher octane gas, but I have no recollection of why that is or whether the view was generally accepted. Anyone have any comments?
You actually need lower octane fuel at higher elevations because the air is thinner. The octane needed is determined by the temperature in the combustion chamber prior to ignition, which is determined by the temperature rise of the air/fuel during the compression process. The initial pressure of the air has a lot to do with that. In simplest terms, as volume decreases, pressure and temperature also increase. If you start with less pressure at the beginning of the compression process you will have less when the process is finished as well as a lower temperature.
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Old 09-16-2011, 12:04 PM   #14
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Related query: I recall someone arguing that higher altitudes warrant using a higher octane gas, but I have no recollection of why that is or whether the view was generally accepted. Anyone have any comments?
Actually, the higher you go above sea-level, the thinner the air. As the air thins, your engine has less compression and requires even lower octane. I know that in Denver, the typical three levels of gas they offer are each a couple notches lower in octane than where I am from in IA. My buddy that moved to Denver from IA also braggs about how the gas is less expensive out there, which is normally the case as the price of gas normally gets higher as the octane rating does.
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Old 09-16-2011, 12:04 PM   #15
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Quote:
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Sounds like couple people need to read up on combustion chamber! And fuel.
You and who else?

Quote:
Originally Posted by daggo66 View Post
bg?
BG They make commercial grade fuel system cleaners, as well as other things. Some of their stuff isn't very good, but the 44K, CF5, Induction Cleaner and most of their products are excellent. You will probably need to find a shop that sells it and get it from them. I don't think they sell to just anyone.
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Old 09-16-2011, 12:04 PM   #16
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Here's a video of the last known guy to use 93 octane in his Jeep.

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Old 09-16-2011, 02:01 PM   #17
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Jeep manual for the 2012's even notes that you should use 87 octane because the pentastar engine will reap no incremental gain whatsoever from using any higher octane.
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Old 09-16-2011, 02:04 PM   #18
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Quote:
Originally Posted by oilwell1415 View Post
BG They make commercial grade fuel system cleaners, as well as other things. Some of their stuff isn't very good, but the 44K, CF5, Induction Cleaner and most of their products are excellent. You will probably need to find a shop that sells it and get it from them. I don't think they sell to just anyone.
Can you recommend anything that might be easier to find?
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Old 09-16-2011, 02:12 PM   #19
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Can you recommend anything that might be easier to find?
Sadly, no. I am generally not a proponent of additives. They are almost universally snake oil. It took me a few years of use and seeing what the BG stuff could do before I even recommended it.

It really isn't that hard to find, there are a lot of shops that carry their products. You can look up shops by zip code at bgfindashop.com. There are a lot of them in the Baltimore area.
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Old 09-16-2011, 02:54 PM   #20
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What is frustrating (on most modern gasoline powered cars) is the lack of a reasonably accessible fuel filter. Over time (as in 50K or 100K miles) the FF collect deposits, requiring the fuel pump (tank mounted, along with the filter) to work harder pushing fuel by these deposits, it pulls more current, and shorten its life. Unfortunately most newer cars and trucks are designed to be easily manufactured, not serviced. So rather than replacing a $20 filter on the frame rail, you pay to have an often “filled to the brim” tank dropped so you can replace the filter and pump at the same time. Cost $300 - $600.
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Old 09-16-2011, 03:16 PM   #21
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Can you recommend anything that might be easier to find?
I just did a quick ebay search for BG and many of their products came up in the results. No idea how the pricing is, but this is one option.

Todd.
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Old 09-16-2011, 03:21 PM   #22
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Quote:
Originally Posted by rockhard98 View Post
Actually higher octane, means slower burn, more power and better millage.. Also burns cleaner so you get less carbon burn/build up on your valves, pistons, and plugs...
Quote:
Originally Posted by oilwell1415 View Post
False. All of it.
Quote:
Originally Posted by rockhard98 View Post
Sounds like couple people need to read up on combustion chamber! And fuel.
Quote:
Originally Posted by oilwell1415 View Post
You and who else?
For whatever it's worth, the Federal Trade Commission agrees with Oilwell. See here.
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Old 09-16-2011, 03:31 PM   #23
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I just did a quick ebay search for BG and many of their products came up in the results. No idea how the pricing is, but this is one option.

Todd.
I hadn't thought about ebay. I took a quick look and most of the prices there are reasonable, but you've got to watch the shipping. Probably better to just buy it locally if you can find it.

For an initial cleaning on a JK I would run a can of CF5 thorugh it with half a tank of gas. Then I would do a can of 44K in a full tank every oil change. The CF5 is stronger stuff, and more expensive, but will do a better job initially. Once it's clean you can keep it clean with 44K. Another product I was really impressed with was their Induction System Cleaner. The best way to do it is by a pro, but you can get pretty good results by allowing the engine to suck it through a vacuum line.
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Old 09-17-2011, 07:44 AM   #24
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Save your money.
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Old 09-17-2011, 09:29 AM   #25
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Unless you are using a programmer like myself that has a 93 octane tune Actually it has a economy tune, rock crawler tune, tow tune, 87, 91, & 93 performance tune. Next fill up I'm going back to 93 tune. It's not my daily driver. Between hoopty truck I tale to work and wife's ride, it gets some usuage.
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Old 09-17-2011, 09:44 AM   #26
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For whatever it's worth, the Federal Trade Commission agrees with Oilwell. See here.


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Old 09-17-2011, 09:58 AM   #27
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My bone stock 2010 that I bought brand new with 8 miles on the clock, pings under moderate loads on 87, and on 89, but not on 93. It also runs noticeably smoother on 93. Not one single person is going to tell me what I hear and feel for myself in my Jeep. I'm not losing sleep over the extra $2 I spend per tank on 93, but I might if I took it to the dealer to try and have them try to figure out why it pings. Apart from that, it runs like a champ. If you follow my posts at all, you know I get above average fuel mileage (18mpg stop and go, 24mpg highway) and have no issues with the power provided by the 3.8. If it's an issue with the tune or engine, it's not an issue I'm unhappy with or would seek to change. Factory freak? Not unheard of. Is that MY case? Who knows.
Take from that what you will, it is what it is. I fill with 93.

Now, to add fuel to the fire, my father worked for DuPont back in the day. He helped develop gasoline additives that were found in pretty much every brand of gasoline. He also worked for a company called Air Products, that developed the first catalytic convertors FWIW, so he's been around the R&D side of the auto industry. He told me when I first asked about gasoline octanes (we've always had hot cars) is that there is much more in 93 octane than just a higher octane rating. More detergents, a more stable and even burn, and typically a better oxygenated fuel overall. He said this is the way it was back in the 60's and 70's anyway, and MTBE had a lot to do with that. Whether or not it's still like that, he doesn't know. This might apply to this discussion, it might not.

What does all this mean? Well, try a tank of 87, then try a tank of 93. See if you feel any difference at all. Let your wife/girlfriend (or husband/boyfriend) fill the tank, so you don't know what you got. For me, there is a definite, measurable difference running 93. For you, there may not be. At the risk of a couple of bucks per tank, you're not losing anything trying.
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Old 09-17-2011, 12:12 PM   #28
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Here in Kansas all we get is 87-89-91 octains. I may try a few tanks of 91 and see if I get any of MR Sinisters results. I try to put a 5.25 ounce bottle of lucus upper cylinder lubricant and injector cleaner in about every third fillup. It treats up to 25 gallons so is just right for my 18.6 gallon tank. I buy by the case at parts store for about $3.25 a bottle. We use howels diesel fuel treatment year round in the semi truck fuel. It is supposed to lub and clean the injectors, and work as a anti gell in the winter. The new low sulfer diesel is so dry that it is hard on the injection system. A set of injectors for a 625 HP cat is about $6,000 so it is cheap insurance. Lucus also makes motor oil additives and gear lube additives, but I have never tried any. Kind of like STP of days gone buy. I am not real big on oil additives, but some people are.
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Old 09-17-2011, 01:57 PM   #29
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Quote:
Originally Posted by oilwell1415
Higher grade gas in an engine that doesn't need it is a waste of money.
+1

The higher octane is just for engines with higher compressions such as the Honda S2000 with 8-9k redline (drowning in model year). Save your money and use what the manuel states.
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Old 09-17-2011, 02:15 PM   #30
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I have to pump it into grandpas caddy, because the engine requires it. And man does it hurt 2.3 gallons for $10. My jeep gets normal gas

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