Is that worth it? Omega 2.5 TD

Hello Omegagemeinde, in winter it was very cheap to buy a 97 Omega 2.5 TD. Disadvantage of the car is that it loses oil somewhere and runs a little rough. Furthermore, it rusts down at the doors and at the rear wheel runs. Ever my question, since in any case the head has to go down, let’s check whether this is still worth the preparation, or rather sell in parts. Workshop with equipment would be available, as well as sound screwdriver knowledge. To my defective I think, I would also like to know where the Omi has its flaws with regard to the possible oil loss. It definitely comes from the driver’s side, but I can’t find anything, but it oils like sow. What I also noticed, it has an additional charge air cooler (since 172 hp) that the said charge air cooler is quite oily, or its supply lines. Are charge air coolers. norm. net operated without oil? Or does that come from somewhere. On the normal cooler I could find no oil traces on the front side. *Edit: Car has 305 tkm on it* THX for your help