not knowing the maintenance or how said vehicle was takin care of or length of time you owned it.
these are some of the things i would do.injector orings,if finances permit it id go with new injectors,ipr orings,turbo pedistal orings,turbo up pipe donuts,high pressure oil system orings,glow plugs,inspect/replace injecor wiring,oil cooler orings.remove all turbo/intercooler boots,clean the oil out of them and make sure they are good and tight.wouldnt hurt to do the ccv mod on it so you dont end up with oil in the intercooler pipes again.remove the intercooler and flush the oil out of it as well.could probably use a coolant flush and refill.
these motors are built fairly well and will last a long time if properly cared for.keep the oil and fuel clean!!