If your are not a fairly good mechanic that can perform your own repairs and maintenance and you do not mind spending a bunch of money on this vehicle, a Jeep CRD
is not for you! Plan on doubling your investment costs after purchasing, we know, as some of us have been there and done that!
Items right after purchase that will need attention are replacing the cam belt and water pump if it has not been done, and this is not an easy job unless you have a lot of mechanical experience replacing cam belts.
Other items that will need attention ASAP:
Getting the crankcase ventilation out of the turbo intake hose, know as elephant hose mod (EHM)
Disabling the ERG valve or removing it completely and the ERG cooler from the motor
Removing the FCV (flow control valve) and replacing it with a Weeks101 elbow kit
Removing the CAT and muffler and replacing it with a free flowing muffler
Replacing the boost hoses to & from the intercooler
Replacing the turbo inlet hose from the air filter box to the turbo
Adding a a lift pump in the tank
Replacing the filter head if it does not have the second generation one already installed
Install a 2 micron secondary fuel filter to protect the injection pump and injectors
Replacing the head studs with VW type and Head gasket if coolant is disappearing
Rocker arm replacement if they have a lot wear on them
Springs and shocks all the way round to replace the ageing and sagging OEM ones
Replacing the glow plugs if it still has the OEM ceramic ones in place
Change thermostat if temperature is not coming up to just below 1/2 (not cheap either)
Window regulators; they go bad a lot on these Jeeps
Change the oil and filter several times to get the oil and engine cleaned out (soot)
Re flashing the computer to get more power and /or fuel mileage
Replacing the Torque Converter with a high dollar one that will hold the torque
Replacing the front pump assemble while you got the transmission out to replace the torque converter (wear item)
Lets see, I probably missed something else????

After you get all this done, you got yourself a pretty good little Jeep!!!!

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Supporting Vendor and Moderator of LOST05 Jeep Liberty CRD Limited 
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
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