$4500 for any car with ~170K on clock is not a good deal.
If you buy it, drive 1 year of 20K. Can you sell it? A car with 190K is hard to sell. That's why lot of private seller rollback
the clock (Tachometer).
10 years car with only 168k km is too good to be true. Only if I really know the seller is the original owner and a good guy, I will go ahead. Otherwise I would stay away from it. Check the document including the original buy contract with his name on it or check at the government office when you do the transaction. Be careful!