How long do 4.0s really last?
12-04-2011, 12:51 AM
#18
Senior Member
Join Date: May 2011
Location: Flagstaff, Arizona
Posts: 609
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1998
Model: Cherokee
Engine: 4.0L I6
My 2000 XJ has 208,000 miles and still running great. The 1998 has 192,000 and still running good. Both are DD's but the 98 sees a lot of trails and such
12-04-2011, 02:19 AM
#20
Junior Member
Join Date: Sep 2011
Location: Lowell, Massachusetts
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1997
Model: Cherokee
Engine: 4.0
My 97 has 211k on it with the original motor. My old 91 2 door had 325k on the original motor but a rebuilt 5-spd. I did blow one on my old 89 at 131k or so. Cleaned the sludge from the oil pan when I did the rear main seal. Blew a week later, it was weird. Also blew the 140k junkyard replacement the same week. Ran good in the wrecked one and had good oil pressure. Cleaned the pan and stuff before I put it in mine. I should have put an oil pump in it, 2 days after install I lost oil pressure and threw a rod. Lets say the new crate motor I installed got a actual gauge rather than the idiot light lol.
12-04-2011, 03:27 AM
#21
Senior Member
Join Date: Aug 2010
Location: Arcata California
Posts: 850
Likes: 0
Received 4 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0
My 96 4.0 AW4 has 176,000 and gets driven by me in the morning and my wife in the afternoon. Double duty daily driver. Runs like a bat out of hell and even gets to hit the beach and trail once in a while. I got her from someone that drove her all the way from mass to san fran and they were the second owner. I have lived in 5 differnt places with her and she has moved my stuff each time I moved. I can get in her now and drive to alaska or south america.
12-04-2011, 12:02 PM
#22
CF Veteran
Join Date: Apr 2011
Location: West Michigan
Posts: 5,558
Likes: 0
Received 1 Like
on
1 Post
Year: 2001
Model: Cherokee
Engine: 4.0
My 96 just rolled over 367,000 last week. shes my DD but goes to the dunes and muddin all the time. And I usually take the trails home from work. I love it!
The following users liked this post:
Curtis Darwin (03-31-2022)
12-04-2011, 12:13 PM
#23
CF Veteran
I don't think the Radiators are worth much after 100k. If one goes pop, it can take the engine with it pretty fast. If in doubt I'd swap the rad, backflush, and keep on top of coolant changes.
12-04-2011, 12:25 PM
#24
Seasoned Member
Join Date: Apr 2010
Location: Oly WA
Posts: 278
Likes: 0
Received 0 Likes
on
0 Posts
Year: 92
Model: Cherokee
Engine: 4.0
my boss has 500,000+ on his 89 cherokee(heads done once) running 35s on it for years, my 91 sport blew at 320,000 running boggers! my 93 has 232,000 and cant be beat in the 6cil mud drags(9 runs 9 1st place trophies)
12-04-2011, 04:26 PM
#25
Member
Thread Starter
Join Date: Nov 2011
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by blackjeeps420
my boss has 500,000+ on his 89 cherokee(heads done once) running 35s on it for years, my 91 sport blew at 320,000 running boggers! my 93 has 232,000 and cant be beat in the 6cil mud drags(9 runs 9 1st place trophies)
12-04-2011, 05:16 PM
#26
Junior Member
Join Date: Nov 2011
Location: West Palm Beach, FL
Posts: 93
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
I am LOOOOOOVING this thread. I may possibly be buying a 95' with 129k miles on it. Now that I'm seeing this, I feel a LOT more relieved buying this Jeep. 
12-04-2011, 05:19 PM
#27
CF Veteran
Join Date: Oct 2009
Location: somewhere Gee oh Dee cant find me...
Posts: 4,529
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1995
Model: Cherokee
Engine: I6 4.0L
I have 124k on the clock and I just checked the oil and it was low a hell. Refilled it, but it still got me thinking.....
How long do 4.0s really last?
I've seen some people with 260k plus on their 4.0s, then I see others with new engines at 146k. What's the deal? Is it different for each motor off the lot or is it a mixture of how you treat it and other factors like that?
How long do 4.0s really last?
I've seen some people with 260k plus on their 4.0s, then I see others with new engines at 146k. What's the deal? Is it different for each motor off the lot or is it a mixture of how you treat it and other factors like that?
i will let you know in 20 years lol
12-04-2011, 05:24 PM
#28
CF Veteran
Join Date: Aug 2009
Location: Herriman, Utah
Posts: 1,534
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
I think for the most part they last well over 200k. My 94' blew a head gasket and threw a rod at 150k. I was broke when it blew, cheapest thing I could find was one from a parted out 91' that had 225k on it for 120 bucks, but the kid swore he kept up on the maintenance. I've put another 15k or so on it and I drive with my foot to the floor often.
12-08-2011, 09:43 AM
#29
Member
Thread Starter
Join Date: Nov 2011
Posts: 184
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by X1994J
I think for the most part they last well over 200k. My 94' blew a head gasket and threw a rod at 150k. I was broke when it blew, cheapest thing I could find was one from a parted out 91' that had 225k on it for 120 bucks, but the kid swore he kept up on the maintenance. I've put another 15k or so on it and I drive with my foot to the floor often.