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Old 09-10-2015, 09:05 AM   #1
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Diesel Engine Break In ?

What's the general rule of thumb on when you can start towing with a diesel engine ? Does weight matter (Trailer is #7500) ? Terrain ? The reason I ask is I am shopping for a new truck to replace my stolen TV and looking to plan a trip in possibly mid October (500 miles round trip) but may not have the truck for very long and not many miles is it ok to do or should I wait ?

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Old 09-10-2015, 09:14 AM   #2
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Just so I get notified on replies: I would be surprised if there is ANY suggested break-in on the engine. Todays vehicles, materials, metallurgy, assembly methods and testing eliminate the requirement. The rest of the vehicle has greater demands for "break-in". (Brakes, etc.) I have built, and dyno tested literally hundreds of engines in the last 10 years. However, no diesels (dyno'ed but never built).
The first oil change would be the only thing I would pay attention to.
Those are typically covered in your owners manual. So, lets see what others have to say.

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Old 09-10-2015, 09:18 AM   #3
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Ford 6.7 Diesel

Without looking I seem to remember our break in was 500 miles limiting load and speed. I do remember that we had friends camping about 100 miles from us when we bought the truck and drove down to have lunch with them to get the first 200 miles behind us.
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Old 09-10-2015, 09:39 AM   #4
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As they said, things are different today. Check the manual but the engine break in today generally consists of making sure you vary your engine speed for the first few hundred miles but nothing else for the engine.

GM did have a break in period on some of their differentials, one I fixed firsthand, my Ram suggested a fluid change in the diff before towing above 10,000 pounds so they sometimes have something along those lines.

Check the book but I don't see any cause for concern.
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Old 09-10-2015, 10:36 AM   #5
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I drove my new 2015 Ram 3500 6.7L dually 4x4 long bed for 600 miles or so then hooked up 18,000 lbs. to the 5th wheel and towed it 580 miles. It should be broke in now. Tomorrow morning its towing 18,000# 80 miles then,
Next week its going to tow 18,000 lbs again for 500 or more miles and should really be broke in by then.
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Old 09-10-2015, 10:52 AM   #6
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My 2015 F350 diesel supplement said not to tow in the first 1000 miles.
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Old 09-10-2015, 11:03 AM   #7
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Originally Posted by lesptr View Post
My 2015 F350 diesel supplement said not to tow in the first 1000 miles.
Did this specifically refer to engine break-in, or just vehicle in general?
ie. Did it say WHY you shouldn't tow for the first 1K ?
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Old 09-10-2015, 11:46 AM   #8
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18 wheeler no break in time and same engine drove them for 40 years just hook up to load and go
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Old 09-10-2015, 11:50 AM   #9
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My Ram's owner's manual said 500 miles.
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Old 09-10-2015, 11:57 AM   #10
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You can see all the owners manuals on line, we just got a new chev high country with the diesel and it specifically states not to tow in the first thousand miles and to keep the speed no higher than fifty for the first five hundred towing, seems like a lot of nonsense really, what if it was bought as a working truck. Anyway just remember that computer is remembering everything.

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