Anyone with over 100k miles on their 3.6 yet ?

[ShadowsPapa]

Wish I would have thought to record the sound of my truck while I was winching a car onto a trailer yesterday. Tick/click, whatever, NORMAL.
Oil seeping is not normal. The weird thing is that the TSB for valve cover leaking and a revised valve cover is only 21 and 22 model years. Apparently the 2020 valve cover was ok, and they made a change that made it not ok in 21 and then they later backed up again.

IMO, your hood open sound is totally normal. Sounds like both of mine have.

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[ChrisNLA]

I just rolled 40k miles. I have oil seeping around my valve covers, which is the second time in 20k miles.

My engine also has a clicking sound but I'm not sure if it's something I should be concerned with. You can also see some of the oil seeping on the valve cover in the video.

Sounds like both of the 3.6's I've had (normal).

 

[Orange01z28]

Nearly 75k. Zero issues

About 30k miles ago, it was getting a burnt fluid smell that made me worried it was starting to burn oil. Turned out to be some beat down power steering fluid; it's looking like I have to replace that yearly now, but so are the woes of 37s

 

[cranbiz]

I have 2 Pentastars. The one on my JK is a 2012. Had a head replaced under the recall at 25K now sitting at 115K. This engine is factory spec'ed for 5W30. The one in the 2017 WK2 is a PUG engine, 117K on it and has never had any issues at all. Factory spec'ed for 0W20. I will have another one in the Gladiator when I pull the trigger at the end of the year.

 

[Bnashvegas]

112k on my 2020 Gladiator. zero issues. Has not been back to the dealer since the day I brought it home.

 

[Rubicon Runnin' Bob]

I just traded in a 2013 JKU (3.6) with 175,000 miles on it

Never had a problem with the 3.6 engine in it

I bought it new in Dec 2012 with 18 miles on it, and ran it for 11 years and 1 day, before trading it in on a 2023 Gladiator, since I couldn't find a Wrangler I liked/wanted.

Before that I had a 2007 JKU with the 3.8 engine, biggest piece of junk engine I've ever had, giving up the ghost at 73,000 miles

Did I mention what I piece of junk the 3.8 engine is/was?

Now the 4.0L in my 2004 Rubicon, that is perfection!

 

[ShadowsPapa]

I just traded in a 2013 JKU (3.6) with 175,000 miles on it

Never had a problem with the 3.6 engine in it

I bought it new in Dec 2012 with 18 miles on it, and ran it for 11 years and 1 day, before trading it in on a 2023 Gladiator, since I couldn't find a Wrangler I liked/wanted.

Before that I had a 2007 JKU with the 3.8 engine, biggest piece of junk engine I've ever had, giving up the ghost at 73,000 miles

Did I mention what I piece of junk the 3.8 engine is/was?

Now the 4.0L in my 2004 Rubicon, that is perfection!

- how did you really feel about the 3.8?
You can be honest.
I've had enough 4.0s in Jeeps I can't even remember without looking up old insurance records and so on. First in 1987, and still have one today - in my car.
You are suggesting it was smart to not have put a 3.8 in it?

 

[DanW]

- how did you really feel about the 3.8?
You can be honest.
I've had enough 4.0s in Jeeps I can't even remember without looking up old insurance records and so on. First in 1987, and still have one today - in my car.
You are suggesting it was smart to not have put a 3.8 in it?

I've got a JKUR with a 3.8 in my garage with 194,000 trouble free miles on it. Not an exciting mill, but it has gotten me to BFE and back countless times.

 

[Rob.G]

So is the general consensus that the newest 3.6's don't have, or are less likely to have the bad rocker arm problem that I hear so much about?

 

[Forum Crawler]

88k on my 2020. Daily driven. Fingers crossed.

 

[Flying J]

I am curious if anyone has reached over 100k miles yet ? Any issues you had to deal with ?

88,800 when I traded it in on a 23 Max Tow. 0 issues on the engine or entire truck!

 

[Bulldog4xfour]

22k and my engine had eaten a cam shaft. No codes but I could hear the chatter in the cab. Luckily the engine tech at my dealership believed me when I said there was a problem, and they replaced the shaft in three days.

 

[BigRed2020]

I am curious if anyone has reached over 100k miles yet ? Any issues you had to deal with ?

I have 59K on my 2020 and no issues!

I'm probably looking at doing spark plugs this summer as I’ll be around 65K-ish… along with diff fluids/ transmission and transfer case. I plan on keeping this Jeep a long time, definitely my dream vehicle!

 

[Badunit]

I'm wondering how well the valve train on the variable valve lift engines holds up, especially for those who tow or go over mountain passes or whatever and have the engine above 2700rpm for long periods of time. That's where the high lift is supposed to kick in.

 

[ShadowsPapa]

I'm wondering how well the valve train on the variable valve lift engines holds up, especially for those who tow or go over mountain passes or whatever and have the engine above 2700rpm for long periods of time. That's where the high lift is supposed to kick in.

Mine is over 3,000 RPM a lot. It's hilly here, often windy. I might drive miles with high RPM.
When I head to where we do most of our business, the entrance ramp to the highway is up hill, then you have a couple of miles of incline, and I might not see 7th gear for much of the drive to Altoona.
When I tow it spends quite a bit of time at about 3300 RPM in the hills on I80 east, sometimes kicking up to over 4,000 RPM.
Honestly, mine doesn't spend much time in the lower RPM area unless I'm on the lower speed limit roads.
The center section of the intake follower actually rides on the center lobe under spring pressure all the time so there's always some rubbing, just with not much force.
I would hope that the larger surface area of the center follower section would help offset the higher pressures involved in the high lift mode - I could compare to the cam-in-block V8s of the past with flat lifters but then those rotated, keeping the area in contact in constant motion or flux, still, that was a lot of force. On engines with cams like I run, it's a pretty abrupt ramp for opening and closing the valves, they are slammed a lot.
I guess what I'm getting at is that if these cams and followers are treated correctly when made, they should last fine.
Most do - these were introduced back in 2016 so there's 8 years of history on them, millions of engines.

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