Its not an elegently designed system, no doubt about that. I'd rather change the lower turbo oil drain pipe and seal than the oil cooler hoses.

You don't need to pull the pan. You don't need to pull the manifold or the exhaust. Where have you been reading this stuff?

Two bolts that admittedly are awkward to reach. Once those are taken out, you can wrestle the two pipe pieces apart. Where they intersect each other, push that toward the right front corner of the car. There is just enough clearance, so they pop apart. Its kind of like that wire jig saw puzzle with the ring and the twisted wire, moving it just so releases it.

Once the two pipes are apart (the top one will come out), you'll need to fasten a hose clamp around the lower pipe. Place a screw driver against the clamp and bang away at it upwards. The pipe will move up and out. You can pick out the hardened seal with a cheap set of picks from Harbor Freight.

Installation is the reverse. Same situation with putting those pipes back together. Angleing them in from the right front corner will get them in place.

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84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)