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Old 09-11-2015, 06:25 AM   #31
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If i remember right the GM manual says 500 miles also

2013 Silverado Duramax 3500HD DRW LB

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Old 09-11-2015, 06:38 AM   #32
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Location: Tiverton, RI
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My Ram 1500 EcoD says no break in required.

The diesel engine does not require a break-in period due
to its construction. Normal operation is allowed, providing
the following recommendations are followed:
• Warm up the engine before placing it under load.
• Do not operate the engine at idle for prolonged
• Use the appropriate transmission gear to prevent
engine lugging.
• Observe vehicle oil pressure and temperature indicators.
• Check the coolant and oil levels frequently.
• Vary throttle position at highway speeds when carrying
or towing significant weight.
NOTE: Light duty operation such as light trailer towing
or no load operation will extend the time before the
engine is at full efficiency. Reduced fuel economy and
power may be seen at this time.
The engine oil installed in the engine at the factory is a
high-quality energy conserving type lubricant. Oil
changes should be consistent with anticipated climate
conditions under which vehicle operations will occur.
The recommended viscosity and quality grades are
shown under “Fluids, Lubricants and Genuine Parts”,
under “Maintaining Your Vehicle” in this manual. NONDETERGENT

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Old 09-11-2015, 06:43 AM   #33
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My 2011 GMC was 500 miles without towing, at different speeds up to 50 mph. Then with the 5er for another 500 miles. Where we camp in Michigan was 500 mile return, so that worked out for us.
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Old 09-11-2015, 11:15 AM   #34
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There is no break in period on a diesel!!!
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Old 09-11-2015, 12:44 PM   #35
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why would there be a break in period for a diesel? My buddy bought a new KW with a Cummins and he hooked up to #25000 load and hauled it to Florida. It had 40 miles on it when he hooked up and my bother in law hooked up to his 32' cougar to his 2500 and went to Myrtle beach. He had around 100 miles on it when he hooked up and went.

Diesels are made for towing so hook up and go
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Old 09-11-2015, 01:11 PM   #36
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My new GMC 2500 HD didn't have many miles on it when our trailer was ready. I went to the dealership (CW) had someone help us hook up to our fifth wheel and away we went home. I really had no choice.
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Old 09-11-2015, 01:38 PM   #37
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Had 500 miles in the 2015 2500 before towing 900 miles, they sad the engine was fine just wanted to allow the Rings and pinion to set in...

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Old 09-12-2015, 10:48 PM   #38
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Originally Posted by cfiowa View Post
My dealer told me don't worry about it just tow it.
Sure, so he can sell another one to you sooner!
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Old 09-14-2015, 12:29 PM   #39
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It isn't about breaking in the engine, it is the differentials (front and rear), it should go at least 500 miles before towing anything heavy, the gears need at least this much time or you can cause them to over heat and burn them up. I have seen differential housings discolored due to heat because the break-in period was not followed. This will also void your warranty.
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Old 09-14-2015, 12:32 PM   #40
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@ bagged, KWs are semis, they are totally different then a 2500/3500 pickup.

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