[vasudeva]

There you are. A nice, balanced suggestion. Key points:

1. Price of 3.75 L gives out a decent car with good ride quality.
2. Not a racing car by any standards, but will get the job done in the city on the highway (not a laggard but not highly peppy).
3. Mileage is low (I know of people here who get 6-8).
4. Of course, since the car is old, expect more of maintenance cost. However, the seller has paid the penalty of depreciation. You may perhaps use it for another few years, and when maintenance starts to kill, sell it at whatever.
5. Things have a habit of malfunctioning in GM cars. Positive is that they do not often lead to getting stuck on the road and costs are not too high.
6. If you do not drive much (say plan to sell it before 1 lakh), then perhaps buy it.
7. Resale is not easy (not much demand for 1.8 or used Optra), so perhaps bargain a bit.
8. How about tyres. If they are new, then that is a big plus. But 55K calls for new tyres and that expense could be 11-14K for 4 tyres.