I overhauled my Khyber's engine in Nov 2008. It costed me 22K Rs. The mechanic overhauled it nicely but the seals started leaking quite early like chamber seal, tappet cover seal etc. He said its not my fault, the seals were not original, although at the time of buying he assured me that every spare part is original. We bought the parts from Sana Autos Saddar Rawalpindi.
Also, he stole 15 liters of petrol from my Car's tank, when it was parked in his garage. Although I gave him 500 Rs for petrol for washing car's engine and its parts.
All the mechanics are like that. So keep these things in your mind.