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Unread 11-28-2007, 04:45 PM   #1
tbta02
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Join Date: Oct 2005
Posts: 39
Break-in For 5.7 Hemi

jeep says drive moderatly for 300 miles . any advice ?

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Unread 11-28-2007, 07:20 PM   #2
MarkoPo
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2005 WK 
 
Join Date: Sep 2007
Location: Hillsdale, Michigan
Posts: 538
This means run it through the RPM range of the motor. Every once in a while floor it from a good rolling start and let it max in the gear and shift. It lets the valves and rings all seat to each other.
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Unread 11-29-2007, 01:36 AM   #3
2008OverlandCRD
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2008 WK 
 
Join Date: Nov 2007
Location: Bellingham, WA
Posts: 109
Just press both the gas and the brake pedal all the way at the same time. It's good for it.

Not really.

I think it will break in just fine no matter how you drive it.

I had an 04 GMC 2500 HD with the 8.1 gas engine and Allison tranny. I broke it in by pulling a 12000 lb boat. I picked up the truck, drove it to where my boat was stored and started towing with 6 miles on the truck. Many thousands later not a single problem.

I think modern engines will do fine no matter how you drive them.
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Unread 11-29-2007, 06:30 AM   #4
Marcus86GLHS
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Join Date: Nov 2007
Location: Connecticut
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just follow the instructions in the owner manual you will be fine, these modern engines break-in easily and with a great deal of forgiveness in the process.
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Unread 12-04-2007, 11:25 AM   #5
njrealtor55
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2004 TJ Wrangler 
 
Join Date: Jan 2004
Location: Flemington, New Jersey
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not sure what jeep does but....

at the bmw factory in the US, they run the cars directly after they are completed on the assembly line. at the end of the assembly line is a dyno room and they run the bmw's at 120 mph for a period of time in there. and that is all with 0 miles on them.

i am sure they let them warm up first - so by the time they start the high speed run the car prob has 1 or 2 miles on it.
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