View Poll Results: What's your odometer reading? Problems??
Voters: 1042. You may not vote on this poll
This is a poll for the JK 3.8L V6 and it's engine longevity. Engine problems so far?
03-19-2017, 09:28 AM
#541
JK Super Freak
Mobil 1 High Mileage 5w30 is now SN rated, so I'm now 2800 miles into it and it appears to have reduced consumption by 30-40%. So far, so good! I'll probably run 10w30 M1 HM this summer.
03-19-2017, 09:57 AM
#542
JK Super Freak
Join Date: Apr 2008
Location: Thunder Bay, Ontario
Posts: 1,267
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The 3.8 was originally designed to run 10w30 oil so its no surprise to me that some burn oil.
At 266,000kkm mine burns about 1/2qrt in 10,000klm a little less with Amsoil 5w40 European blend.
At 266,000kkm mine burns about 1/2qrt in 10,000klm a little less with Amsoil 5w40 European blend.
03-19-2017, 08:03 PM
#543
JK Newbie
Join Date: Jul 2012
Location: Glenwood Springs, CO
Posts: 58
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Viper TB is what I'm rockin. TB spacer does nothing. I also have no hard data except for my own experience driving. A lot less lag when you step on it.
03-22-2017, 05:33 PM
#544
JK Newbie
Join Date: Jan 2012
Location: Draper, UT
Posts: 45
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Cyl 6 miss fire
Threw a Cyl 6 miss fire on the 2012 JKUR with 48000 miles. No other indications of problems but still had a code (will have to find out what code) and now I worry.....
03-22-2017, 05:46 PM
#545
JK Enthusiast
Join Date: Sep 2016
Location: California
Posts: 256
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03-25-2017, 03:54 AM
#546
JK Newbie
Join Date: Oct 2009
Location: Norfolk, VA
Posts: 90
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207000 miles on my 2008 JKU, running 3 inch lift and 35 inch tires....other than a K&N air filter have done nothing to the motor. I have taken it everywhere from the NJ Pine Barrens to Logandale and other than being ridiculous about maintenance and fluid changes no issues...the exhaust manifold has been replaced twice, and all the catalytic converters have been replaced.
03-28-2017, 10:04 AM
#547
JK Newbie
Update after 68,000 (fairly) trouble-free miles :-(
2007 JK Sahara, stock drivetrain & suspension, 68,XXX miles.
Started missing and blowing white smoke/vapor REALLY BAD last week so I put it in the shop of a mechanic I know and trust. Head gasket blowing coolant into #2 cylinder!
I'm pretty pissed that a component that should last essentially forever would fail on a vehicle that has had one owner and excellent preventive maintenance! This engine has NEVER been hot, out of coolant, etc. In fact, I have installed an auxiliary fan in front of the tranny cooler (both installed by me) that I often run during hot weather as it improves performance of the A/C.
My mechanic says that head gaskets are really common replacement items nowadays. I'm old enough to remember head gaskets that lasted for decades. What the heck happened?
Started missing and blowing white smoke/vapor REALLY BAD last week so I put it in the shop of a mechanic I know and trust. Head gasket blowing coolant into #2 cylinder!
I'm pretty pissed that a component that should last essentially forever would fail on a vehicle that has had one owner and excellent preventive maintenance! This engine has NEVER been hot, out of coolant, etc. In fact, I have installed an auxiliary fan in front of the tranny cooler (both installed by me) that I often run during hot weather as it improves performance of the A/C.
My mechanic says that head gaskets are really common replacement items nowadays. I'm old enough to remember head gaskets that lasted for decades. What the heck happened?
03-28-2017, 12:48 PM
#548
Super Moderator
You're not driving it enough 
152k on the clock of my 2010 and it does what it's supposed to do.
152k on the clock of my 2010 and it does what it's supposed to do.
