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Old 03-01-2012, 09:27 PM   #1
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Share Your Mileage on Your JK 3.8L!

So I'm a newb with the last of the 3.8s, a 2011 JKU. That said, I'm curious as to how strong these motors are...durability, longevity...whatever you want to call it... How's yours holding up?

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Old 03-01-2012, 09:37 PM   #2
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Mine is an 08 rubicon with just over 40,000 on it, flawless, no oil use, runs like a watch!
And these engines are built pretty impressive: flat top, Teflon coated pistons, four bolt mains designed after the old Chrysler hemis of the 60s, roller cam, and a cross ram intake manifold.

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Old 03-01-2012, 09:38 PM   #3
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Runs great no problems.avg 22 mpg
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Old 03-01-2012, 09:40 PM   #4
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The 3.8 is a well proven engine and will deliver 250K or more when taken care of.
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Old 03-01-2012, 10:06 PM   #5
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Thanks! You guys running 5w-20 as it calls for or 5w-30?
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Old 03-01-2012, 10:08 PM   #6
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Quote:
Originally Posted by ORNGCR8
Thanks! You guys running 5w-20 as it calls for or 5w-30?
5w20 synthetic from the first oil change
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Old 03-01-2012, 10:17 PM   #7
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2011 with 13000. Full syn
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Old 03-02-2012, 12:08 AM   #8
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2007
98,588 miles
No issues
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Old 03-02-2012, 06:12 AM   #9
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2010 with 7500 miles, averaging just under 19mpg for a combination of hwy, city, and high mountain fire roads and trails. I love my Jeep!!
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Old 03-02-2012, 06:19 AM   #10
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Old 03-02-2012, 07:08 AM   #11
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Mine is an '08 with 37,000 with no issues. My friend has an '07 with 127,000 and it is running just as strong as mine.
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Old 03-02-2012, 07:11 AM   #12
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Old 03-02-2012, 07:12 AM   #13
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26115 on my 07.
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Old 03-02-2012, 07:21 AM   #14
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48,600 on my 07 X. No issues so far.
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Old 03-02-2012, 07:27 AM   #15
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my 2007 Sahara, which i traded for my 2012 Rubi, had 65000 on it when i traded back in Aug. no problems with engine reliability, just overall vehicle performance (imho) with the 3:21 rear. already have over 13000 on the 2012 Rubi and no problems with that one either and like the performance much better.

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Old 03-02-2012, 07:45 AM   #16
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Quote:
Originally Posted by ESP
The 3.8 is a well proven engine and will deliver 250K or more when taken care of.
This of coarse.

Bought my relic 07 w/ 35k in July.

Now has 43K

Runs smooth as hell, no ticking
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Old 03-02-2012, 08:03 AM   #17
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My '08 has a little over 13,000 miles 95% off-road and

Is absolutely FLAWLESS--I use Mobile one 5w-30 syn and she doesn't use a drop of oil-

Wonderful engine !

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Old 03-02-2012, 08:52 AM   #18
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08 with just over 21K on it. Runs strong. Gets 14-15 MPG in town and 17-18 MPG on the highway. Doesn't burn an oil. Slight ticking, but I think it might just be the fuel injectors.

I saw someone posted they were averaging 22 MPG Not sure how that is possible unless they have very small wheels with street tires (perhaps I'm just jealous?)
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Old 03-02-2012, 09:00 AM   #19
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2010 JK sport with auto 26k runs great no motor or electrical problems. I'm getting a consistent 18.5 MPG
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Old 03-02-2012, 09:11 AM   #20
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May only have 25K on mine but it still runs great. Saying that, I have owned two other vehicles with this exact same motor. Both had over 250K and still ran great. One leaked oil bad but ran great. The 3.8 has been around over 20 years and was a great motor for Chrysler. Not worried about the motor at all. Transmission on the other hand, well at least in the Dodge Caravan wasn't as reliable. At least in the earlier models
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Old 03-02-2012, 09:23 AM   #21
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Old 03-02-2012, 09:26 AM   #22
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07 rubi with 53k
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Old 03-02-2012, 09:29 AM   #23
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2007 JKU Sahara - 140K+ miles, no engine issues at all; my mechanic says the engine is solid and will go a long way.

Has been a great Jeep but I have a 2012 on order; I like the new engine's power and don't want to deal with maintenance as I approach 200K.
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Old 03-02-2012, 09:35 AM   #24
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07 JKU 70K and use Mobile 1 full syn... No problems, other than changing out track bolts this weekend.
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Old 03-02-2012, 09:38 AM   #25
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2010, going strong 25000. Expect far beyond 150k. Average 15mpg. Drive mostly city driving. Highway driving average 18 mpg.
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Old 03-02-2012, 10:07 AM   #26
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2011 JK. March 17th will be my anniversary.
8200 miles.
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Old 03-02-2012, 10:26 AM   #27
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Quote:
Originally Posted by GreenRubi View Post
08 with just over 21K on it. Runs strong. Gets 14-15 MPG in town and 17-18 MPG on the highway. Doesn't burn an oil. Slight ticking, but I think it might just be the fuel injectors.

I saw someone posted they were averaging 22 MPG Not sure how that is possible unless they have very small wheels with street tires (perhaps I'm just jealous?)
just wait until you stick those 35s on there!
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Old 03-02-2012, 02:28 PM   #28
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I have 7200 miles on my 2011 JKU as of today. I have a neighbor that has a 2008 and he informed me over the weekend that his had just turned over 100k miles.

Mileage on mine after my re-gear is 15 MPG back and forth to work and around town. My wife and I went on a quick weekend trip about three weeks ago and I got 16.8 MPG average over three tanks. That was at about 70 MPH on the interstate turning 2500 RPM with the cruise control set.

As far as oil I am just doing my second oil change tomorrow. I am a Valvoline nut, I am running the Valvoline SYNpower 5W-30 synthetic with the NAPA Platinum filter.

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Old 03-02-2012, 02:30 PM   #29
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Old 03-02-2012, 04:03 PM   #30
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2010 just over 14k runs great

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