Sorry to hear! If you are just out of powertrain warranty, one option is to approach Ford for financial assistance, 4,000 miles might be a bit much, but no harm in asking. The leak ... was it just discovered? I haven't know Ford to cover hoses (in this case oil line feed), certainly they stick it to you sometimes like in the case of the power steering hose on the Edge. Again, no harm in asking!
As far as effort to get to it & DIY, this is basically what you have to do
Removal
NOTICE: Whenever turbocharger air intake system components are removed, always cover open ports to protect from debris. It is important that no foreign material enter the system. The turbocharger compressor vanes are susceptible to damage from even small particles. All components should be inspected and cleaned, if necessary, prior to installation or reassembly.
With the vehicle in NEUTRAL, position it on a hoist. Refer to Section 100-02 .
Remove the Air Cleaner (ACL) assembly. Refer to Section 303-12 .
Disconnect the wastegate control valve hose from the LH turbocharger assembly.
Remove the 2 bolts from the top of the LH exhaust manifold heat shield.
Loosen the clamp and remove the LH turbocharger intake tube from the turbocharger.
Remove the LH turbocharger oil supply tube bolt and sealing washer.
Discard the sealing washer and oil supply tube filter.
Drain the cooling system. Refer to Section 303-03 .
Remove the LH catalytic converter. Refer to Section 309-00 .
Remove the bottom bolt and the LH exhaust manifold heat shield.
Remove the 2 LH oil return tube-to-turbocharger bolts.
Remove and discard the gasket.
Remove the LH turbocharger oil return tube from the oil pan.
Discard the 2 O-ring seals.
NOTE: Lubricate the oil pan bore with clean engine oil.
Using 2 new O-ring seals, install the LH turbocharger oil return tube to the oil pan.
Using a new gasket, install the LH turbocharger oil return tube and the 2 bolts.
Tighten to 10 Nm (89 lb-in).
NOTE: Align the marks for the LH turbocharger intake tube.
Install LH turbocharger intake tube and tighten the clamp.
Tighten to 5 Nm (44 lb-in).
Install the oil supply tube filter, washer and bolt.
Install the new oil supply tube filter in the oil supply tube block.
Slide the new washer onto the oil supply tube block.
Install the bolt into the oil supply tube block.
Install the LH turbocharger oil supply tube.
Tighten to 40 Nm (30 lb-ft).
NOTE: Make sure the turbocharger wastegate regulating valve hose does not contact the exhaust manifold heat shield.
Connect the wastegate control valve hose to the LH turbocharger assembly.
Install the LH exhaust manifold heat shield and the bottom bolt.
Do not tighten the bolts at this time.
Install the 2 top LH exhaust manifold heat shield bolts.
Tighten to 12 Nm (106 lb-in).
Tighten the LH exhaust manifold heat shield bottom bolt.
Tighten to 12 Nm (106 lb-in).
Install the LH catalytic converter. Refer to Section 309-00 .
Fill and bleed the cooling system. Refer to Section 303-03 .
Install the ACL assembly. Refer to Section 303-12 .
