I found this information in the following link.
Just wonder does non privileged foreigner has to pay duty on the car and how old car can he bring?
What are the restrications on sale of such car?
http://www.phclondon.org/commsection/commImpofVehRules.asp
- Import of cars by non-privileged foreign nationals and restrictions on sale of such cars
A non privileged foreign national who comes to Pakistan on a specific contract of service with any local or foreign firm or with a Government or semi-Government authority in Pakistan can bring a car as personal baggage.