Correct Octane Fuel for 99 Durango - Dodge Durango Forum
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post #1 of 16 Old 11-22-2009, 09:12 PM Thread Starter
Ted
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Correct Octane Fuel for 99 Durango

I have a 1999 Durango with a 5.9L V8. I don't have the owners manual. What octane fuel does the owners manual say to use?
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post #2 of 16 Old 11-22-2009, 10:02 PM
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Unless it's a R/T, it should recommend 87.

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post #3 of 16 Old 11-22-2009, 10:05 PM
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agreed. 87 was standard rating for my 98, i dont listen to it though, lol.

1998 Durango SLT 5.9L, 4x4, FlowMaster DF40 series, Cooper STT's (Beast)
1980 Chevy Monte Carlo...stock for now
1988 Chevy Monte Carlo...427BB/Th200R4 in the works
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post #4 of 16 Old 11-22-2009, 10:54 PM
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Using a higher octane unless it is necessary it a waste of money. The motor is not going to make any more power.

99 Durango 5.9, FT 4x4, IP stage III w/ K&N air hat, M1, SCT, Fastman TB, 1.7 RR, JBA headers, Borla cat back, Martin Saine valve body, Hotchkis swaybars, Blistein shocks, lowered 2" Black Rhino Kenya wheels, 246. 7 RWHP, 319 TQ
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post #5 of 16 Old 11-22-2009, 11:19 PM Thread Starter
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Quote:
Originally Posted by hskrRT View Post
Unless it's a R/T, it should recommend 87.
How do i tell if it's a R/T?
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post #6 of 16 Old 11-22-2009, 11:27 PM
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It would have chrome R/T badges, and the 17" R/T wheels. Color matched front and rear bumpers.

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post #7 of 16 Old 11-22-2009, 11:36 PM
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Originally Posted by hskrRT View Post
It would have chrome R/T badges, and the 17" R/T wheels. Color matched front and rear bumpers.
on my 99 slt the build sheet i got from chrysler says somethin about a R/T package, but i have no R/T badging, but anyway yea, mine recommends 87 as well, and as already stated there is no power or mileage change with higher octanes at least from what i've noticed


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post #8 of 16 Old 11-23-2009, 12:49 AM
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The durango R/T did not exist until 00

99 Durango 5.9, FT 4x4, IP stage III w/ K&N air hat, M1, SCT, Fastman TB, 1.7 RR, JBA headers, Borla cat back, Martin Saine valve body, Hotchkis swaybars, Blistein shocks, lowered 2" Black Rhino Kenya wheels, 246. 7 RWHP, 319 TQ
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post #9 of 16 Old 11-23-2009, 06:23 AM
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ok my bad, i just looked at it its SXi nevermind, still calls for 87 though


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post #10 of 16 Old 11-23-2009, 05:51 PM
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Quote:
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The motor is not going to make any more power.
In fact, it is likely to make less power and get worse fuel economy.

- Kyle
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post #11 of 16 Old 11-23-2009, 06:49 PM
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Quote:
Originally Posted by Ted View Post
I have a 1999 Durango with a 5.9L V8. I don't have the owners manual. What octane fuel does the owners manual say to use?
87 will prolly be OK, i wouldnt go higher than 89 tho....

there *should* be a emissions decal under the hood, the octane rating *may* be on that.

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post #12 of 16 Old 11-24-2009, 01:08 AM
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Originally Posted by dkjones96 View Post
In fact, it is likely to make less power and get worse fuel economy.
i beg to differ. i get better mileage of the 89 with 10% ethanol than i do regular 87 octane. bout a 40mpg difference per tank. iv'e suspected the previous owner may have had a programmer and never taken it off. but i have no way to tell/prove that, lol.

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1988 Chevy Monte Carlo...427BB/Th200R4 in the works
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post #13 of 16 Old 11-24-2009, 01:34 AM
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Quote:
Originally Posted by RebelX View Post
i beg to differ. i get better mileage of the 89 with 10% ethanol than i do regular 87 octane. bout a 40mpg difference per tank. iv'e suspected the previous owner may have had a programmer and never taken it off. but i have no way to tell/prove that, lol.
Wow, 40mpg per tank. Did you install a hybrid motor in that thing?

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post #14 of 16 Old 11-24-2009, 02:07 AM
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He may have put a programmer on it. I checked the owners manual and it does say to use 87 because higher octane fuels can hurt performance and economy.

The local octane is 86 because of altitude but I find my mileage is GREAT if I fill up in a place that is just on the edge of carrying 87 and run the D at sea level.

- Kyle
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post #15 of 16 Old 11-25-2009, 04:40 AM
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Quote:
Originally Posted by hskrRT View Post
Wow, 40mpg per tank. Did you install a hybrid motor in that thing?
nah. i slapped the gerbils and told them to straighten up or id replace them with gueinni pigs.

Quote:
Originally Posted by hskrRT View Post
Wow, 40mpg per tank. Did you install a hybrid motor in that thing?
lol. i can hit york from where i live. 2 1/2hr drive on a lil under half a tank, hit omaha on about 5/8th to 3/4 depending how hard i push it on I80

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1980 Chevy Monte Carlo...stock for now
1988 Chevy Monte Carlo...427BB/Th200R4 in the works
5 Door Whore # 173
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