What is the breakin period prior to towing? - Page 3 - Jeep Garage - Jeep Forum

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Old 11-23-2013, 02:41 PM
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Re: What is the breakin period prior to towing?

Originally Posted by mtnmerlin View Post
I am an engineer, and so is my father who is a strength of materials expert. But I am not giving opinion based on education, experience, or knowledge. The owners manual says in big bold letters "Caution! Do not tow a vehicle at all in the first 500 miles."
I did verify with Chrysler that the diesel supplement is correct. The statement above does not apply. They confirmed what the diesel supplement suggests and that there are no break in requirements for the vehicle other than those stated in the diesel supplement. As the statement in the OM states it may cause Engine Damage and the Newer Diesel Supplement suggests no such condition, the Diesel Supplement supersedes the OM in the towing respect.

I asked specifically if there is any concerns regarding the suspension etc as the OM implied and his answer was "no that is a carry over from older generations. How could we tell people there is no break in requirements in the engine supplement and not warn of the other items in same supplement unless we are suggesting you can somehow tow your trailer with the engine only and not the rest of the vehicle" (I did find the last part pretty funny). He also suggested that considering legislation as it stands, do you think if some jeopardy of imminent damage existed, that we would not plug the trailer hitch with a warning card that says "Do not use for 500 miles"

He said he is not sure how long that warning has been in the original manual but that it is just old school thinking. It is the same warning that is in a vehicle with a completely different transmission.

Anyway, before someone goes and points out the obvious here, I did note the I wouldn't back up to a trailer at 2 miles and tow either. I also would even lean to what Crabman is saying that there is certainly benefit to wearing things in a little (plus my own thinking on cautious towing for the first 1200 miles or so). I simply thought I would throw this into the mix as definitely there is confirmed contradiction between the two instructions. My good friend's comment (Chrysler guy) actually also does point out that from a information standpoint the Diesel supplement is simply not a copy over from prior generations and in fact does encourage some towing in the break in period.

So the conversation has lead me down an interesting path... A couple of engineers say there is probably a material reason for break in which I respect... The Manual seems to be written to some older standards (original OM) and maybe next time I will actually get to the 500 Miles before I start to tow something. Too late now and I am not worried about it, but I am also the guy who will change his oil at about 2000 miles the first time, regardless of what the manufacturer says about not needing to there either. Maybe because I have seen the stuff on the drain plug when I do it I also do my Diff services well early because I do tow a lot, it will be interesting to see how much cleaner these are from prior generations because I do seem to see an improvement there.

All good info guys,

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