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Old 06-04-2012, 02:58 PM   #1
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3.8 lifetime

My 07 just hit 50,000 miles today and I'm just curious on the average lifetime of these engines. I'm well aware lots of factors come in to play when it comes to how long one lasst but with proper maintenance could I get 200,000? Does anyone even own a JK with that kind of milage? What is your guy's milage and what issues would be expected for over 100,000 miles? Thanks Jared -

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Old 06-04-2012, 03:02 PM   #2
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Since 2001, the 3.8 has appeared in all of the Chrysler minivans from 2001-2010, the Chrysler Pacifica from 2004-2007, the 2009-2010 VW Routan, and the 2007-2011 Wrangler. (Chrysler 3.3 & 3.8 engine - Wikipedia, the free encyclopedia).

Look around--especially at the minivans--and you'll find a lot of high mileage vehicles. Well maintained, I'd expect 200k easy.

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Old 06-04-2012, 03:02 PM   #3
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The 3.8 has only been in the wrangler since 07 so you won't see those type of numbers yet. They have easily racked up 250k in other applications. I have nearly 65k on my 09.
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Old 06-04-2012, 03:13 PM   #4
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Yeah im hoping I can get around 200 out of It that would be optimal. I know someone in my jeep club who blew his engine at 55,000 which kinda makes me uneasy but judging by the way he drove it off road it was pedal to the floor constantly on any obstacle mud, water rocks you name it so I guess I'm not surprised but 55,000 out of an engine is horrible...
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Old 06-04-2012, 03:29 PM   #5
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I had a Caravan that had 250K on it when I sold it and it was still running great. The tranny had issues a couple times over the years but the engine was a work horse. I have several family member that have had Chryslers with the 3.8 that had over 200K on them also
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Old 06-04-2012, 03:35 PM   #6
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I have an '08 with the 3.8L in it and it's hitting about 95k right now (I drive about 100 miles, give or take a few, a day). I've never had any problems with the engine. If you change the fluids regularly and don't managed to drive it off a cliff then it should make 200k with no problems.
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Old 06-04-2012, 03:56 PM   #7
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Thanks guys I have also been looking into a supercharger since my powertrain warranty is up in 2 months.. I'm just worried this may be a bad idea? Could running a supercharger for over 100k be easily doable? Or could adding one of these put lot of stress on engine components and adversely could premature failure?? Any say on this would help in my decisions. Thanks
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Old 06-04-2012, 04:11 PM   #8
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Super chargers are friendly to our 3.8l when set up right, and properly maintained
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Old 06-04-2012, 04:41 PM   #9
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Quote:
Originally Posted by JkJared View Post
Thanks guys I have also been looking into a supercharger since my powertrain warranty is up in 2 months.. I'm just worried this may be a bad idea? Could running a supercharger for over 100k be easily doable? Or could adding one of these put lot of stress on engine components and adversely could premature failure?? Any say on this would help in my decisions. Thanks
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Super chargers are friendly to our 3.8l when set up right, and properly maintained
Another thing to consider for a late life supercharger is that a gently used or rebuilt 3.8 should be cheap and relatively easy to find over the next 10 years or so, and it would of course be a perfect fit for low labor costs.

So if you supercharge late your 3.8's life, get 30k more miles, and then have a significant engine issue, you could probably find a gently used or rebuilt 3.8, drop that in, strap your supercharger to it and then get another 100k or more miles.

Of course, the other thing to consider is that engine swaps in general are going to continue to get cheaper. Swaps need to use engines that are no older than your jeep, so as the years go by more and more gently used or rebuilt Hemis and the like are becoming available.

Still though, I've got to think that swapping in a gently used or rebuilt 3.8 five years from now is going to be cheaper than any other form of engine swap.
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Old 06-04-2012, 04:50 PM   #10
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Quote:
Originally Posted by MTH

Another thing to consider for a late life supercharger is that a gently used or rebuilt 3.8 should be cheap and relatively easy to find over the next 10 years or so, and it would of course be a perfect fit for low labor costs.

So if you supercharge late your 3.8's life, get 30k more miles, and then have a significant engine issue, you could probably find a gently used or rebuilt 3.8, drop that in, strap your supercharger to it and then get another 100k or more miles.

Of course, the other thing to consider is that engine swaps in general are going to continue to get cheaper. Swaps need to use engines that are no older than your jeep, so as the years go by more and more gently used or rebuilt Hemis and the like are becoming available.

Still though, I've got to think that swapping in a gently used or rebuilt 3.8 five years from now is going to be cheaper than any other form of engine swap.
C-mom Mike. When you going to slap a SC in that bad boy.

maybe you can do a Sprintex and be the "first" to review lol
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Old 06-04-2012, 04:55 PM   #11
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If you bought your JK new, it should be covered under the lifetime powertrain warranty.

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Originally Posted by JkJared View Post
Thanks guys I have also been looking into a supercharger since my powertrain warranty is up in 2 months.. I'm just worried this may be a bad idea? Could running a supercharger for over 100k be easily doable? Or could adding one of these put lot of stress on engine components and adversely could premature failure?? Any say on this would help in my decisions. Thanks
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Old 06-04-2012, 04:57 PM   #12
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C-mom Mike. When you going to slap a SC in that bad boy.

maybe you can do a Sprintex and be the "first" to review lol
As soon as I find $5k in my couch cushions.

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If you bought your JK new, it should be covered under the lifetime powertrain warranty.
I thought the lifetime powertrain warranty only came with the 2008s. It definitely didn't come with my 2010. Not sure about the OP's 2007.
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Old 06-04-2012, 05:22 PM   #13
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Quote:
Originally Posted by MTH

Another thing to consider for a late life supercharger is that a gently used or rebuilt 3.8 should be cheap and relatively easy to find over the next 10 years or so, and it would of course be a perfect fit for low labor costs.

So if you supercharge late your 3.8's life, get 30k more miles, and then have a significant engine issue, you could probably find a gently used or rebuilt 3.8, drop that in, strap your supercharger to it and then get another 100k or more miles.

Of course, the other thing to consider is that engine swaps in general are going to continue to get cheaper. Swaps need to use engines that are no older than your jeep, so as the years go by more and more gently used or rebuilt Hemis and the like are becoming available.

Still though, I've got to think that swapping in a gently used or rebuilt 3.8 five years from now is going to be cheaper than any other form of engine swap.
Hmm very interesting thanks MTH for putting that into perspective I'm for sure going to be re gearing from 4.10 to something more along the lines of 4.88 or 5.13 may just be what I need for my rig to not be a complete dog in the mountains and up hill on the highway. It has 35's and I also have a set of 33's which have proven to be just as good if not better offroad and just seems more functional for what I do and need. I understand I will be loosing a bit of ground clearance but I've proven to myself that I can offroad very well and it's really just came down to taking things slow and to know your approaching angles and how deep the water or mud is. So as of next month I will be swapping back to 33's but could I get away with 4.88 gears or 5.13 and 33's for some more juice on the highway? And by the way mines an 07 and the lifetime warranty was only offered to 08 and above though I knew about this when buying but it would not matter as that only applies to the original owner and I bought used from the dealer about 2 years ago.
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Old 06-04-2012, 05:27 PM   #14
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So as of next month I will be swapping back to 33's but could I get away with 4.88 gears or 5.13 and 33's for some more juice on the highway?
You're an auto transmission I take it?

Yeah, 5.13s would work for stock tires, so for 35s you'd have no problems. You could go 5.38s if you wanted.

For a manual trans though, I'd stop at 4.88 for 35s. I might even go 4.56, since that'd be comfortable for both 33s and 35s.

Properly regeared, I'd expect either set up with a SC would put out considerably more power than the 3.6 does.

Of course, my disclaimer here is that I haven't actually regeared or run a SC, I'm just restating what I've read and what makes sense to me.
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Old 06-04-2012, 05:54 PM   #15
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Old 06-04-2012, 06:23 PM   #16
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Yeah it's an auto. It's not that I want to go faster I just I need more power for in the mountains towing quads. Also I'm thinking I'll re gear because I have nothing to loose and it's substantially less money than a SC.. Honestly this JK even with 4.10 gears it's just gutless on the highway and painful in the mountains constantly gearing down and revving high to give me some power but it's just not their especially towing.. I was considering a 2012 but I've already investing lots of money and time in this JK plus the tow rating is the same what's up with that??... I told myself the next 1000 I sink into it which a re gear will cost I will keep it till I run it into the ground then buy a brand new one.. Hopefully by then it will be diesel.
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Old 06-04-2012, 06:29 PM   #17
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Quote:
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Yeah it's an auto. It's not that I want to go faster I just I need more power for in the mountains towing quads. Also I'm thinking I'll re gear because I have nothing to loose and it's substantially less money than a SC.. Honestly this JK even with 4.10 gears it's just gutless on the highway and painful in the mountains constantly gearing down and revving high to give me some power but it's just not their especially towing.. I was considering a 2012 but I've already investing lots of money and time in this JK plus the tow rating is the same what's up with that??... I told myself the next 1000 I sink into it which a re gear will cost I will keep it till I run it into the ground then buy a brand new one.. Hopefully by then it will be diesel.
A regear should make a big difference, but at the end of the day you're towing quads in the mountains in a 4000 lb truck on 35s with 202 hp. Just sayin'.

The regear definitely will help though, and in my conversations with Ripp they've indicated you should make the same regear choices with or without a supercharger. In other words, regear and see of that does it for you. If not, you can supercharge.

That'd be my approach anyway.
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Old 06-04-2012, 06:47 PM   #18
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First- a regearing is gonna cost probably at least 1500 BUCKS, plus you may wanna do balljoints/lockers at the same time, for cost savings--

My JKUR weighs in excess of 5200 lbs and I just returned from a 240 mile trip, up the Sierras to 7000ft/camp/fish--/towing trailer--for three days-

My regearing showed power/throttle response/good mileage and the ability to use my AUTO O/D on the freeway--WHEN FAIRLY LEVEL, WHEN TOWING-

Think very seriously about regearing to 5.13/5.38s--GIVE YOU A NEW JEEP !

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Old 06-04-2012, 10:45 PM   #19
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Regarding life of the 3.8, I currently have 78K on my 2009 JK.
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Old 06-14-2013, 02:20 PM   #20
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I have an 09 with 120,000 and she's good to go
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Old 06-14-2013, 08:51 PM   #21
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Has anyone heard from JIMBOX? Haven't seen him post in a long time! He has one heck of a rig!
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Old 06-14-2013, 08:59 PM   #22
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