Life expectancy? -
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Unread 03-16-2002, 02:09 PM   #1
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Life expectancy?

What sort of life should you be able to expect out of a 2.5L and 4.0? Obviously there are a myriad of factors involved here, but what sort of general guidelines are there? Easily 100,000 miles? 150,000, rebuild and expect another 100,000? 200,000 on a well maintained engine? Less for the 2.5 or for the 4.0?

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Unread 03-16-2002, 07:43 PM   #2
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easily 100k on both without a lot of trouble.. 200k is common for those that are taken care of, and i've heard of a few in the 300k+ range. I recommend synthetic oil.
Awwwwwwwwwwww... So he wants to go OFF-ROAD does he????

'93 YJ, 4.0, K&N filter, Borla Header, Borla Cat-Back, Hi-Flo Cat, 3 Core Radiator, D-Rings, TruckNuts, MSD 6A, LockRite Locker in D30, Magnecors, Kickass Stereo, 1" daystar, 31" BFG AT's, Homemade Rocker Guards and Front/Rear air-tank bumpers with tire carrier, 15x8 AR-767 4"BS, BDS 3.5 HD lift, AMA A/C Kit, York OBA, GoFerIt 1" MML, 8,000lb HF/MM Winch, Magellan MAP 330 GPS, PRO-2067 500ch. Scanner, oh, and a CB capable of talking to SATURN!

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Unread 03-20-2002, 01:03 PM   #3
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You're likely to get more durability out of a 4.0L since -- driving habits being equal -- it can do the job with less effort and more smoothness. The 4-cylinder has a lot more noise, vibration and harshness (NVH), is known to throw a connecting rod occasionally, etc. In either case though, 100k miles would be easy enough, but the 4-cylinder would *usually* be in need of a rebuild soon after 100k, since it's always working harder and there's so much more vibration and harshness. The six is inherently better balanced and far smoother, and the extra displacement means it will do the work with less effort most of the time. Of course anyone *can* get high miles out of these 'agricultural' engines with care.
-- Marcus
Cape Canaveral, Florida
2005 Jeep Grand Cherokee Laredo 4.7L
2005 Dodge Durango SLT 4.7L
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Unread 03-20-2002, 02:34 PM   #4
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I have the 2.5L 4-cylinder with over 206,000 miles. It runs very well and offroads just as good as some of the 6s. I can hear the engine fairly well, but not any louder than any other car that I have owned, including my wifes 2000 minivan. It only screams loud when pushing 4k rpm or so, but what engine doesn't.
84 Wagoneer, 207k miles with 4 angry mice under the hood. Uniden CB, Kenwood 2-meter. Tow Hooks, front skid plate. Not pretty, but it runs well, goes where I want it and it's paid for.
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