Thanks for the reply. The truck I serviced was not mine. We used the AMSOIL 5W30 HDD oil and this was a full year before AMSOIL TSB all the DPF engines. At the time of failure there was no recommendation for the 6.4 oil change interval. Like there is now.
I do not own the truck, I told the oner to collect UOA but he did not, the truck failed,he called me after the truck was at the dealer, so I had not to work with when I heard what happened.
I did collect a UOA at the dealer and did find coolant in the oil with caused the jelly sludge with made the turbo fail.
those are the facts, the oil analysis came out good excpt for the coolant contamination.
the Ford mechanics told me NO WAY! coolant will ake the oil milky! I just laughed at them told them keep working...