View Poll Results: Which are you running?
87 Octane
35
92.11%
91 Octane
2
5.26%
93 Octane
1
2.63%
Voters: 38. You may not vote on this poll
Got Gas?
03-29-2009, 09:05 AM
#1
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Year: 1996
Model: Cherokee
Engine: 4.0
Got Gas?
What grade of gas is everyone running in their 4.0? I figure most everyone is using 87 octane but I was wondering if anyone has experimented with higher octane fuels. If you have, did you notice any difference in mileage or performance?
03-29-2009, 09:15 AM
#2
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Year: 1996
Model: Cherokee
Engine: 4.0
never bothered with anything else. compression and air fuel ratio is so basic, whats the need.
03-29-2009, 09:29 AM
#5
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Year: 2004
Model: Grand Cherokee
Engine: 4.7L V8
If your jeep will run on 87, let 'er have it. Save your money for repairs.
Last edited by ol"blue; 03-29-2009 at 09:40 AM.
03-29-2009, 09:32 AM
#6
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Year: 1996
Model: Cherokee
Engine: 4.0
ya i've got no experience on the 4.7 and stuff, nice motors though, some weird oiling problems have come up.
but the poll is about 4.0
but the poll is about 4.0
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03-29-2009, 11:40 AM
#8
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Location: Holland Landing, Ontario, Canada (North of Toronto)
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Year: 1996
Model: Grand Cherokee
Engine: 4.0L Inline 6 Cylinder
sorry to hijack the thread but what do u mean by weird oiling problems? i've got two of those engines sittin in vehicles in my driveway n i'd kinda like to know if i should be watchin for something :P just in case...
03-29-2009, 11:58 AM
#10
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Year: 1996
Model: Cherokee
Engine: 4.0
they have some really small oil passages that have tiny screens in them, also the timing chain oilers are easily clogged. all you can do is change the oil on time every time. 3,000 miles is your best insurance.
03-29-2009, 12:03 PM
#11
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I run 87 octane in my '89 XJ most the time. Every once in a while I'll put 91 octane in it. Seems to keep it running better..
03-29-2009, 12:16 PM
#12
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Year: 1991
Model: Cherokee
Engine: 4.0
stock motors always run the manufactures recommended fuel that how it was set up and that what it will run best on
here in California we have no fuel that compares to what the older cars were designed to run on to many additives
and I think thats why my 91 gets bad mileage
here in California we have no fuel that compares to what the older cars were designed to run on to many additives
and I think thats why my 91 gets bad mileage
03-29-2009, 05:41 PM
#13
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Year: 1988
Model: Cherokee
Engine: 4.0
We have 85 here in town and i dont notice any difference in performance. I have ran them all threw my jeep and its just as happy with 85 as it is with a higher octane.
03-29-2009, 06:39 PM
#15
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Year: 1994
Model: Cherokee
Engine: 4.0
X3 with everyone else on the 87. Never had any problems with it. Ive ran 89 and 91 in my old dodge truck and it made it too rich if you put more than ten gallons in the tank. 87 is the way to go 