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Discussion Starter #1
My owners manual does not recommend any type of fuel injector cleaners or fuel additives. Why is that?

Does anyone here run fuel injector cleaner through your Hemi? If so, what brand?

I normally run Lucas in my other Jeeps but they are the 4.0 inline six, you could pour water through those tanks and they would still run somehow!
 

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Discussion Starter #3
Does is recommend you not use it or just fails in recommending a specific type.
I would have to dig it up to recite it word for word, but as I remember it, it says no fuel additives or injection cleaners are recommended.

I'm planning a trip today to Ohio and I normally run cleaner through my Jeeps on long runs, it seems to do better. I just wanted others to share their experiences with me.
 

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I always dump a can of seafoam in a full tank when going on a long trip, no problems in the three years iv'e owned mine...(knocks on wood)....
 

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I would think it has something to do with the HEMI's variable cylinder feature that cuts out cylinders to save on gas at cruising speeds. This Jeep's engine technology isn't found in those older normal engines and that's why it probably doesn't want crap in the fuel since it's probably sensitive to stuff like that. If you're not having any problems with your engine there's no need for additives or cleaners anyways. Just a waste of money.
 

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Discussion Starter #7
Well I fought the urge to stay with my usual tendencies and made the trip without the injector cleaner.

My mileage was okay, I got 19.1 for the 400 mile trip from Roanoke VA to Canton Ohio running between 60 and 75. There are a lot of mountains in the southern half of that trip and it stayed at 18 until I hit the flat land and it started climbing back up.

I just turned 11k on my 09, I have had it one year this week.
 

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I run Lucas fuel cleaner in mine and have had no problems. If you want to be safe then I would suggest you buy a few tanks of 97 octane that is going to clean up a little bit on its own.
 

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I'm no expert by any means, but 97 octane is not recommended either.

If I recall correctly, they don't recommend anything higher than 89 octane, and 87 is fine but they say 89 for improved performance.
 

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Going to high in octane "usually" does NOT hurt anything. I guess you can argue it burns hotter and might throw something off, but I doubt 97 Octane will do that.

Its more a waste of money if anything, since it doesn't get you anything.

Higher octane doesn't atomize/vaporize as well, so using a higher than recommended octane is often a cause for poor starting and cold running in cold weather. It can also reduce mileage a bit.

This is what my Owners Manual (2010) has to say on the subject.
Materials Added To Fuel
All gasoline sold in the United States is required to
contain effective detergent additives. Use of additional
detergents or other additives is not needed under normal
conditions and would result in additional cost. Therefore,
you should not have to add anything to the fuel.
Fuel System Cautions

CAUTION!
Follow these guidelines to maintain your vehicle’s
performance:


• The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance
and damage the emission control system.
• An out-of-tune engine, or certain fuel or ignition
malfunctions, can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your authorized dealer for service assistance.
• The use of fuel additives which are now being sold as
octane enhancers is not recommended. Most of these
products contain high concentrations of Methanol.
Fuel system damage or vehicle performance problems
resulting from the use of such fuels or additives is not
the responsibility of the manufacturer.
NOTE: Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
Methanol is corrosive to a lot of seals and even some metals used in a lot of fuel systems.

Seems like the standard OEM warning against the aftermarket additives industry, which most are a rip-off, if they do anything at all, besides lighten your wallet, they do more harm than good.

Thats NOT all additives, some are quality; but I agree with the advice, in most cases people over use additives NOT realizing that most of the quality fluids they buy already have additives doing exactly what they are looking for additional additives that do NOT do as good of a job as the original fluid does already.
 

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From the Owner's Manual:

5.7L Engines (If Equipped)

The 5.7L engine is designed to meet all
emissions regulations and provide satisfactory
fuel economy and performance
when
using high quality unleaded gasoline having an octane
range of 87 to 89. The manufacturer recommends the use
of 89 octane for optimum performance. The use of
premium gasoline is not recommended. Under normal
conditions, the use of premium gasoline will not provide
a benefit over high quality regular and mid-grade gasolines,
and in some circumstances may result in poorer
performance.

Light spark knock at low engine speeds is not harmful to
your engine. However, continued heavy spark knock at
high speeds can cause damage and immediate service is
required.

Poor quality gasoline can cause problems such as hard
starting, stalling and hesitations. If you experience these
symptoms, try another brand of gasoline before considering
service for the vehicle.
 
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