How many miles you have on your 6.4 PSD
I bought my 2008 F-250 brand new on 10/23/2008 & I now have 50,200 miles & i've only has a DPF light warning on the dash, but the next day it went away
Mines a job 1 with 39xxx but I've only had it for a little over 3 months. Only issues since I've had it: clock spring in the steering column messed up the cruise, torn rubber boot on the steering, lines for what I think run the 4x4 kept popping out of their holders. Of course it's on its 3rd P/S pump since it was new but I haven't had any issues with that *knock on wood* and had something to do with the pass VC fixed before I got it.
The only time I've had anything DPF related was when I first got the truck and set it back to stock-I forgot the DPF was in my garage and it threw some codes, wiped codes put a canned tune on with DPF off and no more issue.
I have a 2008 F-250 Super Duty Ext.Cab XLT 213,000 miles stock. Previous owner was Enterprise Fleet Leasing, went through 6 radiators when they owned it. I am installing Coolant filter kit, CCV mod, DPF/Cat Delete with a tuner...have not made up my mind on tuner ...still looking.
I have a 2008 F-250 Super Duty Ext.Cab XLT 213,000 miles stock. Previous owner was Enterprise Fleet Leasing, went through 6 radiators when they owned it. I am installing Coolant filter kit, CCV mod, DPF/Cat Delete with a tuner...have not made up my mind on tuner ...still looking. 

I've never had any issues with the radiator
your truck must have been built before 8/2007



