Proper engine break-in procedure

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Mar 15, 2009 | 09:20 AM

#21

Amway Man

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From: Green Bay, CO

Quote:

Originally Posted by ronjenx

The only thing I can think of that you would do when new, is let the diff gears cool after 10 or 15 miles, a couple of times. Again, almost all people don't do this and they are fine. But, if you were to have just regeared, (which is what a new vehicle is like), cool down would be prudent.

That makes sense - had to do that when I regeared my XJ. How long of a cool off? If I'm going 120 miles would it be needed the whole way home or just a hand full of times?

Mar 15, 2009 | 10:25 AM

#22

ronjenx

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From: Maine

Quote:

Originally Posted by Amway Man

That makes sense - had to do that when I regeared my XJ. How long of a cool off? If I'm going 120 miles would it be needed the whole way home or just a hand full of times?

A couple of times would put you way ahead of what most people would do.

Mar 15, 2009 | 10:57 AM

#23

xerofall

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From: Tooele (two-willa), Utah

Quote:

Originally Posted by RedneckJeep

I've been drivin mine like I stole it ever since I drove it off the lot. It just turned 14K.

I've heard that's the correct way too... but it's hard to sort through opinion and fact when talking about vehicles. There are too many variables. Vehicles are all different.

For me, it's difficult to push a new vehicle too hard... I mean I just shelled out $28K for it, lol.

Mar 16, 2009 | 05:07 AM

#24

vw73182

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From: BFE Indiana

WOT = no no

Mar 16, 2009 | 04:15 PM

#25

Rhino64

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From: Great state of Arizona

I drove mine between 70-90 mph for 160 miles as Ive done every new vehicle Ive ever owned and have never had a problem. If its going to break thats the best time when the warranty fresh.

Mar 16, 2009 | 05:07 PM

#26

CIJeep

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From: Oxnard, CA

Quote:

Originally Posted by Amway Man

Hello

I've tried searching for about 30-40 minutes and cant find any thread that says what the proper break in procedure for the 3.8 is. I will be purchasing mine from a dealership that is about 120 miles away from my house (long story) and am pretty sure that I'll have to trailer it home in order to not put that many miles on it right away since they would all be 65 mph+ on the interstate.

Can someone please post what they've read maybe out of their owners manual?

Thanks!

Download the owners manual from the Jeep site. It has break-in instructions.

Mainly it is don't go fast for the first 25 or so, vary your speeds. They emphasized to "STEP on the GAS" frequently. They want you to break it in with acceleration in mind.

So I drove slower for the first 15 then jumped it up to 80 and varied from there. 85, 90, 75 but around 80. It still is one heck of a claim jumper.

Oh, I also changed the oil at 1500 miles, it freaked them out, but I wanted any breakin shavings out of my oil pan. It has been 3k changes ever since.

Mar 16, 2009 | 07:24 PM

#27

Mr.ZAP

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From: College Station & Arlington, Tx

Yeah I have 8500 miles on mine and have already changed the oil 3 times

Mar 16, 2009 | 07:46 PM

#28

Amway Man

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From: Green Bay, CO

Hmmm....

Well I'll be driving it home varying the speeds and throttle pressures. I'll go easy around Denver for the first 30-50 and jump on the highway after letting her cool off. Stop off in Parker to let her cool again. And Castle Rock...maybe one more before just letting her stretch her legs and vary the speeds/gears/throttle.

This seems to be an overall average of what everyone is saying.