The dealer told me that the inlet tube on the turbo is leaking oil and possibly the turbo itself is leaking. Could this be related to the EGR problems?

Check your CAC hoses... the one directly above the turbo may be leaking, which will fool the dealer into thinking that your turbo is going downhill.

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2006 Jeep Liberty CRD, Limited
GDE Eco Tune, GDE TCM Tune, Bauer 203* Tstat, Amsoil EaA 201 Filter, Clean MAP, Samco CAC Hoses, Magnaflow Muffler #12226.
New Mopar Fuel Filter, K&N Filterminder, Fumoto Oil Drain Valve
225/75R16 Hankook Dynapros

I bet it's just the hose seeping oil from the brilliant DC design of inhaling it through the turbo. If you haven't done the EHM or the previous owner didn't, that will be wet with oil after enough thousands of miles.

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05CRD: GDE Hot ECU & TCM tunes, Provent, Cat filter, Facet lift pump, TransGo kit, Florida TC, Samcos, stainless brake lines, HDS thermostat, Renegade light bar,
Bilstein adjustables, Al's Gen 4.5 Arms, 235/85-16 Duratracs, DTT rear, Elocker front, EVIC+TPMS, Turbo timer, McNally pillar gauges, Weeks Stage II kit.