Just to make sure, does oil have to be in the coolant system for it to be a worn head gasket? Or does the oil in ports 1-3 of the manifold suggest that? What originally started my suspicion of the oil leaking in the exhaust was a failed turbo, but I have tried to install 2 supposedly working turbos and now the oil is in back of the turbos leaking out 5 quarts at a rate of 3 mins.

Here is what I know about the major repairs to the vehicle:

New Glow Plugs around ~120,000 miles.

Repair to the Wastgate ~130,000 miles

Replaced the Evaporator ~ 160,000 miles

Replaced the Radiator ~ 170,000 miles

There is no history that I know of to indicate the seals, gaskets or anything else major has been repaired.

I really appreciate all your patience and guidance. Also, I do really well with pictures, so if there are any links to "How to"s for the stuff above, it would be greatly appreciated.