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Unread 12-12-2007, 07:16 PM   #1
Stuicism
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TJ engine reliability comparison

So I found a TJ (with inline 6) but it sold 2 days before I could get to it. Now I am back on the market and trying to weigh my options. I have always heard from the forums that the inline 6 is the only way to go. I know the inline 6 is super reliable but how about the 4 cyl based solely on reliablility? I can put up with the sluggishness and shifting to pass on the highway but I don't want something that can't make it to 200k miles.

Would it be better to buy a 4 cyl with around 90k miles or an inline 6 with 150k?

How long can I reasonably expect a 4 cyl to last without any major work?

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Unread 12-12-2007, 09:16 PM   #2
Renegade_Rick
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If you are planning on tires over 31 inches tall then you really should get a 4.0L. The 2.5l 4cyl is basicly a short vershion of the 4.0L I6. In fact the 4L inline 6 is based on the 2.5L 4 popper. Bolth will last well over 200k if you take care of them. However the 4 popper will last a bit longer than the inline 6. But the I6 is a good long lived powerfull motor. They really do work very well off road. But with 3+ buck a gallon gas if I bought a TJ as my primary car it would have a 4 popper with a 5 speed.


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Unread 12-12-2007, 09:44 PM   #3
Stuicism
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Thanks for your response, I don't plan on running anything over 31's but it is nice to have the option. I have never heard that the 4 could last longer than the 6, that is interesting. Is the gas mileage that noticeable? I was under the impression it was hardly noticeable. Of course I may notice it more with the 4 because I live in a very flat area and dont have to worry about it bogging down on hills.
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Unread 12-14-2007, 03:23 PM   #4
2xHorn
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I have a 95 YJ with a 4banger at 115k miles. Still a very strong little engine. Nothing more than good maintenance.

Runs strong. Starts well in cold weather. Does everything you could ask of a brand new engine, much less one that old.
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Unread 12-14-2007, 03:36 PM   #5
XJK
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ya the 4.0L has proven itself to be a much stronger motor then the 4cyl and last longer. i would highly recommend going with the 4.0L when purchasing your jeep.

-Kyle
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Unread 12-16-2007, 01:09 AM   #6
Stuicism
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Thanks guys, I have been searching the forums a good bit and found that this is a frequent question so I apologize for the annoyance. I have decided the 4 will fit me fine for my needs.
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Unread 12-16-2007, 02:19 AM   #7
XJK
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Quote:
Originally Posted by Stuicism
Thanks guys, I have been searching the forums a good bit and found that this is a frequent question so I apologize for the annoyance. I have decided the 4 will fit me fine for my needs.
well if you have searched the forums you are by far ahead of a lot of the members on the forums. glad you found the 4cyl to be good for you.

-Kyle
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Unread 12-21-2007, 11:48 PM   #8
Stuicism
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Well I bought my jeep wednesday and I am loving it. I ended up with the 6 and am very happy with the performance. You can see pics on my other thread here http://www.jeepforum.com/forum/f9/my-new-tj-questions-498221/
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Unread 12-22-2007, 12:42 AM   #9
XJK
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Quote:
Originally Posted by Stuicism
Well I bought my jeep wednesday and I am loving it. I ended up with the 6 and am very happy with the performance. You can see pics on my other thread here http://www.jeepforum.com/forum/showthread.php?t=498221
congrats on finding something that suited you. what are your future plans for the vehicle?

-Kyle
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Unread 12-22-2007, 08:49 PM   #10
Stuicism
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I'm not really sure what the future holds for my jeep. It will be mild upgrades until I finish school due to lack of funds + the need for it to be a decent daily driver. Definitely some bigger tires soon though.
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