Hello I'm Chris a Ford Employee and Certified Engine/Transmission Specialist.
Thanks for asking your question. I am eager to get your vehicle back up and running correct, I am here to help you out for a small fee far less than a dealership and easier on the wallet, so if this information is of aid PLEASE PRESS ACCEPT and help me out financially by paying the small fee (which you selected). Please reply if further discussion is needed.
I suggest you check high pressure oil. Since the reservoir is full and you have fuel pressure. Then possible suspects are going to be a failed pump for the high pressure oil system or an oil leak in the high pressure system. The ICP pressure will tell if there is a high pressure concern.
Yes it can if a large majority of oil pressure is being lost.
have you verified the glow plugs are working correct?
Have you tried to start it after it has been plugged in a while. Have you tried to bleed the fule lines to see if there is air between the filter and injectors. Will it run off of ether.
Small amounts of oil in the turbo is fine. This is normally for a diesel with some miles.
So when the engine is cold the engine will not start even with the glow pugs being used. I need you to verify the glow plugs are actually getting energized. You can remove one and see if it heats up or you can take a voltage reading on a glow plug wire.