bad oil cooler

[ktbtrucking]

reassembled.
flushed radiator twice with "simple green" ( 3 gal green 9 water)
3rd time 2 gallons of red coolant and rest water, still have some oil residue at the top of water tank ( put new one)
will drive it a little on Monday and see what happens, will try to test old cooler also for leak

regarding torquing
* 75 ft-lbs torque on turbo mounting bolts instead of what the book says.
book says 75 on turbo mounting bolts
35 ft-lbs for oil cooler
44 ft-lbs for manifold

friends of mine recommended more torque but followed the book
only put 95 ft lb on turbo
any thoughts on torquing for future???
the engine has 1.2mil miles
when idling and when I take oil dipstick out it is pournig oil - is this engine done???

Thank you in advance