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Old 02-18-2011, 10:37 AM   #1
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Engine Break-In, First 20 Miles, Run It Hard - what do you think?

I found numerous websites that claim if you run your engine hard for the first 20 miles, you will have a much better running engine over the life of the vehicle.

Break In Secrets--How To Break In New Motorcycle and Car Engines For More Power

The 2011 Wrangler owner's manual also states:

Quote:
ENGINE BREAK-IN RECOMMENDATIONS
....Drive moderately during the first 500 miles (800 km).
After the initial 60 miles (100 km), speeds up to 50 or
55 mph (80 or 90 km/h) are desirable.
While cruising, brief full-throttle acceleration within the
limits of local traffic laws, contributes to a good break-in.
Wide-open throttle acceleration in low gear can be detrimental
and should be avoided....
So the factory recommends "drive moderately" and "brief full-throttle acceleration"

Many others insist that in order for the piston rings to properly seat well, it is critical to "run it hard" for the first 20 miles or so. "Running it hard" is done ONLY on a fully warmed-up engine.

Anybody have any thoughts on this?

Mabar

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Old 02-18-2011, 10:43 AM   #2
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since you asked.....

and really I have no opinion on how YOU should run YOUR rig....

Consider this question:

"Why should we believe the same experts that conceived, designed, tested, built and marketed successfully for over 70 years, a product that will function under an astonishing variety of conditions world wide, for decades and hundreds of thousands of miles?"

Given the qualifications and experience of those advising otherwise, tell me 3 reasons to believe THEM. Tell me the BIGGEST reason to believe them?

Oh....and ask who is covering the warranty on the product?

My opinion is, that IF there were a cheaper/easier/better way to do this stuff, the factory would choose that advise.

If there were a way to get more power/more MPG/more performance/longer service/lower cost...would they hide it from their customers and rely on some web site to spread the news?

I don't think so....YMMV

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Old 02-18-2011, 11:00 AM   #3
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Which one honors your warranty? Which one gives absolutely no warranty what-so-ever?

I've been taught to just keep varying the engine RPMs during the break-in cycle. Don't go on a road trip that will have your engine sitting at 2200 RPMs for 3 hours straight. I don't baby it, but I certainly don't flog them either.

I've broken in 3 engines - one a rebuild (350 Olds), 2 straight from the factory (900 cc and 1400 cc Kawasakis). Haven't had any long enough to really tell you longevity (very few miles on the Olds...only a couple thousand max, 9,000 and 15,000 on the Kawasakis, respectively).
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Old 02-18-2011, 11:23 AM   #4
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Exclamation

If you follow the owners manual you cant go wrong!
Like the others mentioned who better to trust when it comes to these things. I have worked at 5 dealerships. I would advise to listen to what the manual says. Thats why it is there. It should not really be up for debate. Its a guide, follow it and your jeep will have a long life.
People have told me to run it hard as well but its not their Jeep, if I run it hard and break something are they going to pay for it? Especially when the engine is brand new and all the parts are still adjusting.
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Old 02-18-2011, 01:41 PM   #5
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Follow the owner's manual like was stated. The engine is tested at the factory and run through a sequence of varying rpm's to seat the rings along with other components before it is shipped to Toledo. After it is installed in the vehicle it is subjected to additional testing before it ships, so in theory it is almost totally broken in. Except, for when the customer takes delivery Chrysler RECOMMENDS a break in period not only for the engine but for the entire drive train. But, it's your vehicle you can take their advice, which I would strongly suggest, or you can use and abuse it. Your call.
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Old 02-18-2011, 01:46 PM   #6
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people will disagree but we race just about everything we own on the strip from sport bikes, to vetts, viper, stang and camaros.... Always broke them in the way we were going to drive them and thats fast. We have never had one single problem from breaking them in this way and our cars bikes ect run strong. Everyone has thier own opinions on this though so its up to you. im not saying abuse it, we just dont baby our stuff.
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Old 02-18-2011, 02:51 PM   #7
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Quote:
Originally Posted by greenenvy View Post
people will disagree but we race just about everything we own on the strip from sport bikes, to vetts, viper, stang and camaros.... Always broke them in the way we were going to drive them and thats fast. We have never had one single problem from breaking them in this way and our cars bikes ect run strong. Everyone has thier own opinions on this though so its up to you. im not saying abuse it, we just dont baby our stuff.
I could have said the exact same thing and it wouldn't have been a lie...doesn't mean a thing without knowing how long you've owned said vehicles.
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Old 02-18-2011, 02:54 PM   #8
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You should tow it stock on a trailer to the garage, put 35s on it, then tow it to a mud hole and do the first 20 miles there at 4000 rpms in 4-lo.

Im just kidding listen to the manual
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Old 02-18-2011, 05:59 PM   #9
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My first 20 miles was stop and go city traffic. After that, was 40 miles of 60-70 MPH. I've always just driven them from the dealer, like I'm gonna drive it on a daily basis. 7 different new vehicles over the years. Never had a drive-train problem. And I average 20K miles a year.
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Old 02-18-2011, 06:49 PM   #10
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Quote:
Originally Posted by Bubba68CS View Post
I could have said the exact same thing and it wouldn't have been a lie...doesn't mean a thing without knowing how long you've owned said vehicles.
many of them were owned for a long time, some not to long at all. although i know who ended up with the ones that are gone and no problems.
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Old 02-18-2011, 06:58 PM   #11
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here are a couple that fall into the break it in hard and it will go fast catagory
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Old 02-19-2011, 09:42 AM   #12
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Running an engine hard before it is broken in is not the best choice. The owners manual advise is pretty good. I think the best engine break in procedure is to gradually increase the load/driving with a chance for the engine to cool down inbetween.
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Old 02-19-2011, 10:13 AM   #13
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I had friends decades ago who did just that with their motorcycles. They typically were the ones who always had some excuse to not go on long journeys with the rest of us due to some perpetual unresolved new mechanical crisis.

what someone does to their OWN rig is of little concern to me....I got my own schedule of 'belief'.
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Old 02-19-2011, 10:34 AM   #14
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Quote:
Originally Posted by greenenvy View Post
here are a couple that fall into the break it in hard and it will go fast catagory
Ahhh....those must be nice. They look awesome

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