Looking at some TJs, all with the 4.0L and Im curious at what point should i become nervous about the miles on them, the 3 Im looking at have between 99,000 to 119,000 miles, the one i really like has 103,000 miles. From what i read 100,000 is no big deal for a 4.0L, is this a safe assumption? I know it all hinges on how the last person maintained it, but i have no way of knowing that, all three vehicles are at dealers. Thank you,
Id be more worried about the frame rusting out than the motor going bad . When I was looking for jeeps I found 2 that looked great and had low miles then I climbed under them and saw the frames where about shot ! 1 was rusted thru behind the rear wheel . Like boogie said get under it and give it a good look over check everything and even poke around the frame if it looks rust bad or you see any holes in it walk there are pleanty of good ones out there. remember theres an a$$ hole for every seat ! dont be one
I just bought one with 87,000 on it and the engine looks as good as the day it came out of the factory. It all has to do with maintenance. A good, thorough look-over should reveal any problems. You know what you're looking for, but here's some advice: take a mechanically-savvy buddy with you that has no vested interest in you buying any particular Jeep. Two sets of eyes are better than one, and your friend won't be suffering the excitement that gets people when they're buying a new ride...so they're going to catch more than you will, guaranteed. If the Jeep passes inspection, don't worry about the mileage.
About the miles: A friend of mine (same one that went with me to look over my newest Jeep) and I had jobs back in high school, working for an off-road shop, tearing down AMC 4.2's and 4.0's...I can promise you that maintenance makes a difference. You could tell which engines had been neglected, because they had seventy or eighty thousand miles on them and they were trashed. Also, you could look at engines that came from wrecked vehicles that had three or four hundred thousand miles on them, and were in excellent shape. It's all about how it's been maintained.
If it's worth doing, then it's worth overdoing.
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