how many miles did you get out of your 4.0?
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3,196 Posts
I hear 250,000 plus from people!
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2,395 Posts
I'm currently at 336,790... 
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613 Posts
Drive it till it breaks, don't rebuild it before that.
A properly maintained and never overheated 4.0 can be expected to go over 200k before major work.....If she then still has good compression and not burning oil, just keep going
If at 100k, you still have great compression and not burning oil, then install new top quality water pump and timing chain and gears, and spark plugs and wires, belt and other minor stuff.
Take care to prevent overheating and cooling system corrosion, and keep your oil fresh...you'll be fine
A properly maintained and never overheated 4.0 can be expected to go over 200k before major work.....If she then still has good compression and not burning oil, just keep going
If at 100k, you still have great compression and not burning oil, then install new top quality water pump and timing chain and gears, and spark plugs and wires, belt and other minor stuff.
Take care to prevent overheating and cooling system corrosion, and keep your oil fresh...you'll be fine
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140 Posts
i had 2 that had 246000 plus when i sold them. still ran great. thats why they are not sold anymore. last too long.
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562 Posts
I've always heard that these 4.0L motors were bullet proof and know several people with it that have 200,000+ and going strong.
Guy down the road from that owns a tree cutting service has over 400,000 miles on his daily driver and it still runs like a champ and I know he doesn't take the world's best care of his vehicle.
My Jeep only has 118,300 miles on it and compression is still spot on and hasn't burned a drop of oil in the 5 years I've had it.
Yep,
Last to long and not built anymore, just like the 3800 motors in my Pontiac Grand Prix!!
Guy down the road from that owns a tree cutting service has over 400,000 miles on his daily driver and it still runs like a champ and I know he doesn't take the world's best care of his vehicle.
My Jeep only has 118,300 miles on it and compression is still spot on and hasn't burned a drop of oil in the 5 years I've had it.
Yep,
Last to long and not built anymore, just like the 3800 motors in my Pontiac Grand Prix!!
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591 Posts
I wish they'd made the frame and the rest of the Jeep to last as long as the 4.0 without rusting out. I'm not replacing or overhauling my engine until it goes bad, but if I were going a major build like a Brute conversion I might do it early to start fresh...
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Lol all these posts about their engine not burning oil.... My 2002 has 37,000 miles on it and burns about 1.5 quarts every 5,000 miles, but she keeps going strong!
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2,395 Posts
God damn. Mine leaks a little from the oil pan seal. But doesn't burn any. What did you do to that poor engine?!jeepwayoflife said:
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Im scared to know what the PO did to it... I do full synthetic oil change every 3,000 miles with Fram Tough Guard filter. It also worries me because it doesn't leak any, it burns it.jherrington said:
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284 Posts
2003 with 25,000 miles. Runs like new. (snicker)
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