An Audi A4 for only 40 lacs! This is gem of a car in terms of look and far apart as compared to Civic in terms of class and luxury.
As compared to the new rubbish Civic 1.5 that cost about 60-80 lacs this is a high value car. If I were you, I would have bought the car eyes closed for weekend drive.
I don't think we have Mercedes branch in Pakistan. But we do have the Audi branch that is a plus.
The car may be old but this is not an issue if you can find the spare parts. You be should research and look online (partscentral, etc) if common parts such as filter, shocks, break pads, lights, immobilizer ring unit, and others that could go wrong in an old car.
You can also read Audi A4 4th generation reviews at PakWheels that are generally positive.
I say go for it if you can afford the spare parts and repairs.