Optra costs a lot but resale is quite low, don't buy it for 10 ... max price for an outstanding car should be under 9.
If merc, BMW are white elephants then optra is intermediate elephant. repair would not be a problem it is just the availability and cost of spares. If u buy a well kept car and keep it well kept it might give u a good service without any major repairs for another 4-5 yrs.
I could be potential buyer in future