C70 T5 a few questions about the car

Hello you. I have a very big problem. I fell in love… and was in love with a C70 T5… i.e. I will buy (if no one will change my mind here) one (must!)…. In order to tackle the whole thing a little more seriously, I have to buy a C70 T5 from the first series (1998-200?). I have already informed myself a little bit and I drove a sample today. So to my questions: 1. Is the engine durable? (so would also a checkbook of C70 with 245k on the clock come into question?) 2. What do I have to pay attention to with the car (known weaknesses, diseases, etc….) 3. I have seen with the search models with a final pot (right) and which with 2 end pots (left and right). What is it about? Is this just a cosmetic change in the course of the model evolution? 4. Can you have the chip optimized? If yes meaningful? ( -> I am talking about efficiency) 5. How expensive is the car in terms of wear? How can I answer the spare part?