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Unread 10-24-2003, 04:16 PM   #1
jlr69s
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How long will my 4.0L last??

I have just under 95k miles on her. How long should I expect this engine to run with proper care?

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Unread 10-24-2003, 05:36 PM   #2
Bighaeb
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Provided that it really does get taken care of and driven normally, It is safe to say around 150000, but you can expect more than that in MOST cases. I personally have a 93 YJ with the 4.0 in it and its kickin along great at 135000 miles. She will most likely be one that will see well over 200000, but I'm a freakazoid when it comes to preventive maintenance. People who buy my used vehicles shouldn't have a thing to worry about. And I drive like a granny on road.
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Unread 10-24-2003, 06:30 PM   #3
KsZJ
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I got 210K on mine and it sill runs great. Just take care of the motor. I have seen the 4.0 last well into the 300's with no problem. I have only had to replace little things like the water pump... nothing major.

-J
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Unread 10-24-2003, 10:22 PM   #4
lunar rover
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I think the question is mis-stated. It's very broad & you can realistically only expect guesses for answers. How about those w/ 4.0 post your mileage & WHAT (specifically) you DO for maintenance (regular, preventative, & repair) This, although it could be a rather lengthy project, maybe needing a database eve, would give you a truer account of WHAT ppl are doing to prolong the life of their motor, WHEN they are doing it, & WHICH parts can be expected to fail, so that they can be closely monitored, so that when their estimated time is due, they can be taken care of before they become a repair. Just my .02.
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Unread 10-25-2003, 12:21 AM   #5
imnotu
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lunar has a point. my jeep is a 95 that just hit 110 k today. since i started reading this site in march i have seen posts where people have had there 4.0 hit 250k or higher. i expect mine to do the same.
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Unread 10-25-2003, 01:50 AM   #6
91XJLimited
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My 4.0HO is at 190,xxx with only a VERY small oil leak, and I've had to replace the water pump. I regularly change the oil, but my priority in "Preventive Maintenance" isn't as high as it should be.
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Unread 10-25-2003, 08:22 AM   #7
jlr69s
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Quote:
Originally Posted by lunar rover
I think the question is mis-stated. It's very broad & you can realistically only expect guesses for answers. How about those w/ 4.0 post your mileage & WHAT (specifically) you DO for maintenance (regular, preventative, & repair) This, although it could be a rather lengthy project, maybe needing a database eve, would give you a truer account of WHAT ppl are doing to prolong the life of their motor, WHEN they are doing it, & WHICH parts can be expected to fail, so that they can be closely monitored, so that when their estimated time is due, they can be taken care of before they become a repair. Just my .02.

Very true, thank you! I have only had to replace my water pump, just barely leaking, replace the cat, and my expensive... $800, AC evaporator core. But thats it other than the regular maintainance stuff. Keep em commin everyone!! -Joey
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Unread 10-25-2003, 08:34 AM   #8
BenSampZJ
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Mine has 179,000 miles and the only major repair that I had to do was the fuel pump--$700. The ZJ's fuel pumps are screwy and come in one big assembly that's why it's so much. Other than that I've had a leak in the rear main seal...that wasn't too expensive. Then other small stuff. Nothing to worry about.
Good luck,
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Unread 10-25-2003, 02:00 PM   #9
demtjcj
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173k and still going. change oil regurlarly. it does consume alittle oil but nothing major.
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Unread 10-25-2003, 03:08 PM   #10
RockPaws
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As everyone has said, thes engines will run a long time with proper maintenance. Just keep the oil changed, maybe some of the high mileage oils could be used. I run synthetic in all of min, with no problems.
One of my customers Jeeps (89' XJ) has over 235K and still runs great. I have replaced many other parts on the vehicle. But the engine keeps going and going.
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Unread 10-25-2003, 11:13 PM   #11
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The 4.0 has a reputation of being an engine to last longer than the vehicle it's in. My 4.0 has 143,000mi. There have been a few hiccups but nothing major. At 110,000 the Crankshaft Position sensor went out, about $100 repair. At 138,000 the cracked exhaust maniforld had to be replaced, $400 w/ upgrade to full header. Oil change about every 4000 mi, runnin synthetic. it's not the engine that usually fails, but everything around it.
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Unread 10-28-2003, 09:30 AM   #12
KillerZJ
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Quote:
Originally Posted by jlr69s
I have just under 95k miles on her. How long should I expect this engine to run with proper care?
however long you own your jeep if you take good care of it
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