Forum Discussion

klr650goldwing's avatar
Nov 01, 2019

2012 6.7 Diesel

I'm looking to buy a 2012 f350 super duty 6.7 TD CC LB 4X4. I'll be pulling a 12,500 lb. 5th wheel trailer. My question is how many miles is too many for this truck? I'm new to diesels and from what I've heard diesels last longer than gas engines, but with no personal experience, I need some help from you diesel experts. If you were buying this truck how many miles would cause you to shy away from the truck?

37 Replies

  • I have an early gen "15" picked up in May of 2014.. It has 55,000 on it and it's a beast......
  • I think you can get a HPFP failure kit on the 6.7 for about $300. It would still suck to lose the fuel pump but at least it would just mean replacing the fuel pump and not the whole fuel system, and that's where you get into the huge repair bills. I wouldn't own any CP4 equipped diesel unless I was able to put one of those kind of kits on it.
  • On average, for that year you would expect to see somewhere between 100k to 120k miles depending on how the truck was used. Double or triple that, I might look twice. As mentioned, earlier version of this truck had fuel pump problems. I add Cetane Boost to the truck in my sig with every fill up and have not had any issues. I have not heard of the radiator, bearing or glow plug problems mentioned earlier so I can't speak to that. If you're serious about this truck, I would definitely look at the service history and make sure there haven't been any problems in the areas of concern.
  • I think the cards should be laid down. What kind of mileage are we addressing? :h
  • As far as mileage on an emissions equipped diesel, I would be more leary of a truck with low miles versus one with higher miles. Lower miles generally means a lot of city driving and idling which causes a lot of emissions equipment issues. Higher mileage generally means a lot of highways miles which is the perfect condition for emission equipment. About 15-20k a year would likely mean that it was mostly highway driven. If there is a way to check the idle time, I would prefer to stay under 10-15% idle time compared to total hours.

    As far as that specific truck is concerned. There were a lot of fuel pump failures in those years causing $10k worth of damage. It is a hit or miss depending on how the previous owner took care of it along with other factors. It is not a case of if, but when due to the design of the pump.
  • I'm not a diesel expert but my 2012 6.7 4WD has about 125000 on it and it has had only minor problems and not many of those. We pulled a 34 ft fiver all over the western mountains with it.
  • klr650goldwing wrote:
    If you were buying this truck how many miles would cause you to shy away from the truck?


    1; seriously; 1

    The first to early 15's had problems. Now the fan bois don't want to hear this but it's true.

    They had turbo, high pressure fuel pump, radiator, glow plug and some lower end bearing problems.

    Out of those 3 the HPFP was the most troublesome. 15 grand or so to fix that little mistake. The radiator came it at about 2 grand or so to fix. The glow plug problems will cost you a new engine.

    2015 on up they changed a lot of those problem parts.

    If you're set on a Ford get the 2015.5 on up. The later you go the less problems they had.