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  #1  
Old 11-22-2009, 09:12 PM
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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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  #2  
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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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.
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  #4  
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.
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Old 11-22-2009, 11:19 PM
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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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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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Old 11-22-2009, 11:36 PM
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Quote:
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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Old 11-23-2009, 12:49 AM
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The durango R/T did not exist until 00
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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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  #10  
Old 11-23-2009, 05:51 PM
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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.
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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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Old 11-24-2009, 01:08 AM
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Quote:
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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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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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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.
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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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