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Old 01-26-2020, 03:21 PM
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Engine comparison: 2006 to 2014

I am looking at a 2014 Rubicon with 135,000 miles on it. My limited experience with Jeeps is based on the 4.0 liter, in-line 6, which seemed to last forever. I had almost 250,000 miles my '91 Cherokee and it still ran strong. I have heard many similar stories on the older engines. I would not hestitate to purchase a 2006 with 135,000 miles.

How about the newer Pentastar engines? Is there enough information to indicate that they have similar life spans?

fyi.....the type of driving I do is basically local and on rural roads. No rock climbing or off-road thrills.


Feedback and opinions welcomed.

thx

kc

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Old 01-26-2020, 04:58 PM   #2
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My only experience with the Pentastar engine was in a 2012 Town and Country minivan and it worked flawlessly until my wife totalled it a month ago at ~85,000 miles. They've been using that engine in Wranglers for 9 model years, even in the new JL. It appears to have been generally well received.

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Old 01-26-2020, 05:44 PM   #3
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No v6 is balanced 60 v or 90 v and none will ever last like a straight six

The add some crap like start stop technology and realize most bearing wear is on start up and donít expect very long engine life


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Old 01-27-2020, 02:32 AM   #4
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I wouldent buy anything built by Chrysler and expect it to be reliable. I hope you have good public transportation if you do because you will need it.
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Old 01-27-2020, 06:06 AM   #5
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Originally Posted by Digger84 View Post
No v6 is balanced 60 v or 90 v and none will ever last like a straight six

The add some crap like start stop technology and realize most bearing wear is on start up and donít expect very long engine life


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I agree. IMO stop/start sucks, I'm happy it can still be disabled easily. If Chrysler adds Direct Injection to the 3.6L that will delay any plans I have of buying a new Wrangler or Grand Cherokee for a few years. I'd want to be damn sure Chrysler got DI right, so I'll be watching the early adopters commentary closely, if they go that route with the 3.6. Flame suit on.
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Old 01-27-2020, 07:21 AM   #6
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Quote:
Originally Posted by K.C.E. View Post
I am looking at a 2014 Rubicon with 135,000 miles on it. My limited experience with Jeeps is based on the 4.0 liter, in-line 6, which seemed to last forever. I had almost 250,000 miles my '91 Cherokee and it still ran strong. I have heard many similar stories on the older engines. I would not hestitate to purchase a 2006 with 135,000 miles.

How about the newer Pentastar engines? Is there enough information to indicate that they have similar life spans?

fyi.....the type of driving I do is basically local and on rural roads. No rock climbing or off-road thrills.


Feedback and opinions welcomed.

thx

kc

the 3.6 for the most part, less the early ones with the head issues 12/13 and 14 seems to have a higher fail rate on the oil cooler, have been okay. I think still to early to tell if it will have the legend status of the 4.0L at some point. Though 4.0L also had their share of issues.

Price plays a key point right. If the jeep was 10-15k vs 20-25k, you would feel better about taking the risk.

My best advice is buy the newest jeep you can find, in the best condition with the lowest miles in your price range. Also may be worth having a 4x4 shop look it over if you find one you really like.
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Old 01-27-2020, 08:28 AM   #7
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The add some crap like start stop technology and realize most bearing wear is on start up and donít expect very long engine life
The OP said he is considering a 2014 JK, which does not have ESS (start/stop)
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Old 01-27-2020, 08:30 AM   #8
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My 2012 has 142K+ on it. It has been pretty much trouble free. The thermostat died around 100k and the oil cooler assembly broke at about 139k and that is the only engine work it has needed besides just normal maintenance stuff like plugs, coil packs and oil changes.
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Old 01-28-2020, 05:44 AM
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Engine Comparison: 2006 to 2014

Updating my thoughts/experience after driving a 2006 Sport and 2014 Rubicon.

1. Somewhat unfair to compare a Rubicon to a Sport; but here is my general impression comparing the different 'generations' [I am an old Corvette guy and think of models as 'generations'; the Jeep thing is something I have always wanted to do and getting a late start].

2. Engine specific, the 4.0 is just going to be hard to beat. The Pentastar did perform well and history may record it as the better engine. Time will tell. The comment on 'engine balance' on in-line versus 'v-6' will always be true; however, I wonder if that is somewhat offset with the computer technologies developed and implemented in the newer engines. As a mechanical engineer, I think they should have never left the in-line 4.0l.

3. As with all automobile technologies, the 'backyard mechanics' become more and more frustrated with the newer models. At times, it feels like a conspiracy plot to frustrate us older 'grease monkeys'. Repairs on the 4.0l will always be simpler, easier, and doable......and more fun!

4. Nostalgia has its place. I love the older Jeeps and they have their place; however, after driving the 2014, the technology upgrades, safety upgrades, and overall comfort of the Jeep was significant and undeniable.

5. For a kick-around, fun, and low budget, I would still default to the older Jeep. For everyday driver in a high density population, I would spend the extra money for a 2014 or newer. Driving that 2014 was impressive to me.

Anyway, just for conversation and somewhat bored at 0540 hrs, those are my thoughts.

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