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Old 11-16-2013, 11:36 AM   #1
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3.6L woke up?

Well, not sure if this is a coincidence or not but my JK just hit 4,000 miles and it appears the 3.6L has awakened from a coma. When I read from others that this engine finally starts responding after several thousand miles, I've always thought it must be a mind over matter effect.

However, my other thoughts are the season has changed and temps have dropped 10 to 20 degrees. Could this be the real reason?

Anyway, if this is due to the engineers unleashing the 3.6 DOHC motor after a good break in period, then all I can say is wow. Rock on...

Btw.. I'm running Chevron 89 octane fuel and Pennzoil 5w30 factory fill.

In addition, before anyone says I'm wasting money on the 89 gas, that's my decision - not here to debate 87 vs 89 octane fuel. It runs fine, no KR going on with my Jeep.

.

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Old 11-16-2013, 11:46 AM   #2
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I was waiting for my 3.6 to " wake up " as well. I hit 5000 miles and it acutally feels more sluggish now then the first few thousand. Auto still shifts crappy as well first two gears. Im glad it worked for someone.

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Old 11-16-2013, 11:47 AM   #3
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butchered it....." actually"
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Old 11-16-2013, 11:55 AM   #4
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This is a thing? I have never heard of this....I just figured it was the gearing and all in my Rubicon that was making the engine seem weaker than I thought it would be giving the stated power ratings it has...now granted if you open it up and get out of the green on the RPM gauge it has plenty of power...but I expected more low end power than it has. Climbing steep terrain in 4-HI in first gear should not make the engine lug as much as it does in mine, or so I would think. I guess I will just have to get used to it.
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Old 11-16-2013, 12:04 PM   #5
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I'm reserving judgment about this waking theory, could be the colder weather...

During the summer, this motor ran between 212-220 degrees. Now it takes this engine longer to reach operating temps which is around 195-212, due to the lower temps around here. I've never had an engine that didn't run better in a colder climate - elevations being equal.

I also learned along the way the oil pressure will stay between 60-80 psi until the coolant reaches exactly 195 degrees, then drops to 35-40 psi. Just an observation.

.
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Old 11-16-2013, 12:05 PM   #6
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My Rubicon is a few weeks old. So far I like the engine. It's great actually.
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Old 11-16-2013, 12:54 PM   #7
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Quote:
Originally Posted by m998dna View Post
Well, not sure if this is a coincidence or not but my JK just hit 4,000 miles and it appears the 3.6L has awakened from a coma. When I read from others that this engine finally starts responding after several thousand miles, I've always thought it must be a mind over matter effect.

However, my other thoughts are the season has changed and temps have dropped 10 to 20 degrees. Could this be the real reason?

Anyway, if this is due to the engineers unleashing the 3.6 DOHC motor after a good break in period, then all I can say is wow. Rock on...

Btw.. I'm running Chevron 89 octane fuel and Pennzoil 5w30 factory fill.

In addition, before anyone says I'm wasting money on the 89 gas, that's my decision - not here to debate 87 vs 89 octane fuel. It runs fine, no KR going on with my Jeep.

.
Do they switch to a 'Winter Blend' gas in your area?

I hit 4K on mine yesterday.
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Old 11-16-2013, 02:26 PM   #8
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That is very interesting. My 2013 just hit 2500 miles, but I've been very happy with the 6 cylinder engine. I have a manual transmission, so I'm not sure if it has to do with the automatic transmission.

Of course, my last Jeep was a 2006 with a 4 banger, so I was impressed with the power. Here's hoping mine wakes up even further.
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Old 11-16-2013, 03:12 PM   #9
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I thought it took about 500-1000 miles to break in a modern engine.
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Old 11-16-2013, 03:18 PM   #10
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Quote:
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Do they switch to a 'Winter Blend' gas in your area?

I hit 4K on mine yesterday.
Yes... Maybe that's it.

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Old 11-16-2013, 03:20 PM   #11
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I thought it took about 500-1000 miles to break in a modern engine.
I know in the owner's manual it references a break-in ... I think ~500 miles.

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Old 11-16-2013, 03:27 PM   #12
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My Rubicon is a few weeks old. So far I like the engine. It's great actually.
Absolutely! This DOHC motor likes to sing... At my second free oil change the dealer poured in 5w-30. It made an immediate and noticeable difference. This engine purrs now.

Not burning any oil...

I'm happy with my oil change intervals up to 5,000 miles...

.
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Old 11-16-2013, 03:44 PM   #13
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I thought "winter blend" gas was actually less efficient. I have always noticed a drop in my gas mileage in all my vehicles over the years once they switch over.
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Old 11-16-2013, 07:45 PM   #14
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Btw.. I'm running Chevron 89 octane fuel and Pennzoil 5w30 factory fill.
Thought 2013 running 5w20. Maybe I am wrong?
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Old 11-16-2013, 08:16 PM   #15
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Doubtful it would take that long to break in an engine. More likely you're just driving the vehicle normally now and the computer has finally learned your driving style. The electronic throttle likely "learns" over time too. Colder temps + winter gas + ECU finally learning your driving style is probably what's going on.
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Old 11-16-2013, 10:20 PM   #16
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I remember my Mercury Mystique used to almost feel like it was turbocharged during the winter because of the cold air. It had nothing to do with what blend of fuel I was using or anything.
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Old 11-17-2013, 01:10 AM   #17
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The 2013s state 5w 20 on the fill cap. The12s state 5w 30. Same engine. If thats my problem ill consider switching. Ive owned two 4.0 straight six TJs and those jeeps hauled a$$ off the line, plenty of instant torque and power. None of this minivan lag drive by wire crap. If I never owned those two I probably would think the JK and its Jesus engine as the best thing on the planet. Its just not the case!
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Old 11-17-2013, 07:21 AM   #18
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Loving my 2014....3.6 plenty of power...can't even imagine owning a Jeep with any less hp.

You can always bump it up to a hemi?
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Old 11-17-2013, 10:32 AM   #19
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The 2013s state 5w 20 on the fill cap. The12s state 5w 30. Same engine. If thats my problem ill consider switching. Ive owned two 4.0 straight six TJs and those jeeps hauled a$$ off the line, plenty of instant torque and power. None of this minivan lag drive by wire crap. If I never owned those two I probably would think the JK and its Jesus engine as the best thing on the planet. Its just not the case!
I understand what you're saying. I still have my 1991 4.0L H.O. Cherokee - there's trade offs in IMO.

Eventually you'll be able to load a Diablo tune on that 3.6L and it will remove the throttle lag and firm the shift points. My AW4 shifts firmer at 180K miles, than my NAG1 at 4K miles.

The 5w30 oil didn't do anything for performance, just quieted down the motor some. The 5w20 factory fill is for fuel mileage - my dealer changed it to 5w30 without me asking them to do it. I didn't even know they did it. I just noticed it was a tad quieter when I started it and drove home. Then after looking at the RO I noticed they poured 5w30.

.
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:: 2002 Chevrolet G3500 LWB 8.1L - motovan
:: 1991 Cherokee Laredo 4.0L HO - resto in-process
:: 2010 Cherokee SRT8 6.1L Hemi - sold
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Old 11-17-2013, 10:56 AM   #20
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Quote:
Originally Posted by m998dna View Post
Well, not sure if this is a coincidence or not but my JK just hit 4,000 miles and it appears the 3.6L has awakened from a coma. When I read from others that this engine finally starts responding after several thousand miles, I've always thought it must be a mind over matter effect.

However, my other thoughts are the season has changed and temps have dropped 10 to 20 degrees. Could this be the real reason?

Anyway, if this is due to the engineers unleashing the 3.6 DOHC motor after a good break in period, then all I can say is wow. Rock on...

Btw.. I'm running Chevron 89 octane fuel and Pennzoil 5w30 factory fill.

In addition, before anyone says I'm wasting money on the 89 gas, that's my decision - not here to debate 87 vs 89 octane fuel. It runs fine, no KR going on with my Jeep.

.


Mine "woke up" after like 1000 to 1200 miles or so.... Right now I'm at about 6400 or 6500 miles...
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Old 11-17-2013, 11:11 AM   #21
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In my '04 GTO I always noticed when the weather got colder. Beyond not running the A/C, the engine really did feel stronger when the weather was colder. I wouldn't be surprised if the 3.6 was similar.

But it could be a mileage thing where the computer changes the tune once a particular threshold is reached. It could be the gas. It could be the oil. It could be the fact that you're not running the A/C any more.
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Old 11-17-2013, 02:44 PM   #22
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I switched to 5-30 oil as well. Noticed a much quieter motor right away.
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Old 11-17-2013, 03:08 PM   #23
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Thought 2013 running 5w20. Maybe I am wrong?
The manual says that... it's also perfectly okay to run 5w30.

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Old 11-17-2013, 10:47 PM   #24
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The manual says that... it's also perfectly okay to run 5w30.

.
Is yours a 13'?........you have a get out of jail free card since you have proof the dealership switched it to the 5w 30. Im worried if I do it and something goes wrong their going to void the warranty. I just feel the oil is too light weight for this engine. I can practically hear a metallic sound when i get on it. I live in Ca so our weather is pretty bland.
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Old 11-17-2013, 11:14 PM   #25
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Is yours a 13'?........you have a get out of jail free card since you have proof the dealership switched it to the 5w 30. Im worried if I do it and something goes wrong their going to void the warranty. I just feel the oil is too light weight for this engine. I can practically hear a metallic sound when i get on it. I live in Ca so our weather is pretty bland.

Yes.... here's what the owner's manual says.

Fiat 955535-S1 = 5w30 Opie Oils - Fiat 9.55535-S1


I also wouldn't be hesitant to run 89 octane fuel either.. like I said, they did this to meet fuel economy and emission thresholds.

.
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Old 11-21-2013, 08:29 PM   #26
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So your telling me I have to by the above 5w 30 Fiat oil? not just any 5w 30
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Old 11-21-2013, 08:38 PM   #27
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Thought 2013 running 5w20. Maybe I am wrong?
Your correct! 2012 5w30, 2013 and 2014, 5w20. That is Chrysler/Jeeps recommendation for viscosity.
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Old 11-21-2013, 09:41 PM   #28
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So your telling me I have to by the above 5w 30 Fiat oil? not just any 5w 30
No, just needs to meet that spec... 5w30 is just fine. Don't sweat the small stuff and something that is a non-issue.

Pennzoil Platinum 5w30 also meets MS-6395 spec... 5w20 or 5w30 is just fine.

They did this on the 13's for fuel mileage only.

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Old 11-22-2013, 04:28 PM   #29
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My 3.6 wakes up everytime I get on her....seems the ricers and lowered trucks around here think all jeeps are slow...

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