Turbo / exhaust problems

[ORANGETX]

I have a 2009 F250 that I purchased new in November of last year. When it was 2 months old, it had an entire new head "assembly" put on b/c the valves had stuck and hit a cylinder and broke several push rods. last week, it went back in the shop for it constantly being in Regen. Upon inspection, they found that the high pressure turbo had the shaft seal spewing oil all inside the engine compartment and likely into the exhaust thus causing the constant regen. They replaced the turbo, and DPF and sent me on my way. Within 30 miles, it was back in regen again. completed the cycle and the 60 mile later went back into regen...again. I took the truck back to them and they checked parameters and ended up replacing the mass air flow sensor. Then the check engine light came on. They put the old mass air sensor in and sent me on my way. The truck is now going into regen about every 80-100 miles and I am told that is normal. The problem I have, is that prior to it sticking in regen a few weeks back, it only regen'd about every 400-450 miles. Does anyone have any ideas what would be causing it to want to regen so often?

[First_Ford]

My guess would be that the DPF is partially clogged and it is now short cycling. I would of guesses that they would have changed it after the oil contamination. I have learned alot about Ford aand there warrenty in the past year, and it is not worth the paper it is printed on. They will not do any more than they have too, emphasis on have too. They are correct though, that 60 to 100 miles can be normal. I would drive through a few mor cycles and see if it improves.