Fuel grade for 3.5L Charger? 89? - Dodge Charger Forums
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post #1 of 20 Old 03-30-2006 Thread Starter
stodge
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Fuel grade for 3.5L Charger? 89?

I don't know much about the Charger, and the 3.5L engine in general. What grade fuel does the 3.5L require - 87, 89 or 91? I thought I read that it needs 89 - anyone explain the reasons why? I can never understand why certain engines need certains grades.

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post #2 of 20 Old 03-30-2006
charger Bill
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Cool Re: Fuel grade for 3.5L Charger? 89?

The owners manual calls for 89 octane. This is due to the fact that the 3.5L engine has a slightly higher compression ratio. The higher the compression ratio the higher the octane rating needed to control detonation or pre-ignition. Hope this helps.
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post #3 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

I've always pumped 89 for my 3.5L Magnum. Says the same thing in the owner's manual. I don't think 87 will hurt it just may get slightly worse gas mileage.

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post #4 of 20 Old 03-30-2006 Thread Starter
stodge
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Re: Fuel grade for 3.5L Charger? 89?

"I don't think 87 will hurt it just may get slightly worse gas mileage."

This is the part I don't get - I've heard people say the same thing about the V6 in the Nissan Maximas, but I don't know whether running 87 won't damage the engine or not.

Thanks for the replies.
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post #5 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

Think of it this way there are tons of 3.5L Chargers and Magnums in car rental fleets. Do you think for a minute that people are filling with 89 when they gas up a rental? It's a matter of timing. The timing will adjust for 87 but your hp will drop slightly.


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Originally Posted by stodge
"I don't think 87 will hurt it just may get slightly worse gas mileage."

This is the part I don't get - I've heard people say the same thing about the V6 in the Nissan Maximas, but I don't know whether running 87 won't damage the engine or not.

Thanks for the replies.
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post #6 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

I have the Hemi, but I thought I read in the manual that 87 was OK in the V6, but 89 was recommended for the Hemi. I may be wrong? I also have heard people on my other forum indicate lower octane yields better gas mileage than higher octane.

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post #7 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

The manual says 87-89, so it's a matter of what you want to put into it. There are, from my understanding, alot of cars out there that say running a higher octane fuel will run better, but most of that is B.S.. Obviously, the more performance type engines, i.e. the Hemi, would need to run something higher. But if this is your daily driver and you don't plan to put a bunch of mods into, I think you would be fine to use 87. I'm getting ready to drop all of my mods in my car over the next few weeks, so I have been running 89 since I got mine 2 weeks ago and am averaging about 21.5-23 mpg depending on how I drive. It all depends on how you use it and what you plan to put into it.

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post #8 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

I run 87 in my SXT, and that's all I've ever used. I normally get 20-21 mpg. I decided today, actually, to fill up with 89 for the next few tanks and see if there are any differences in feel, mileage, etc., especially with the intake and exhaust mods that I have.

As for higher octanes getting worse fuel mileage, I believe that that applies to fuels with octane ratings much higher than the recommended rating. I filled up with 87 octane a few tanks ago and added an octane boost fuel additive. Now, I don't know just how much the effective octane rating of my fuel was after I added the additive, but I do know that my mileage dropped dramatically. I got just uner 19 mpg, if I remember correctly, with no change in driving habits.


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post #9 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

I used 87 for the first few tanks, and then switched to 89. I was surprised to see my mileage and power go way up with the 89. (SXT)
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post #10 of 20 Old 03-30-2006
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Re: Fuel grade for 3.5L Charger? 89?

Quote:
Originally Posted by steelwheels
I used 87 for the first few tanks, and then switched to 89. I was surprised to see my mileage and power go way up with the 89. (SXT)
That's nice to hear. I hope that I have the same experience.
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