Try Shahid, right in front of Suzuki Margalla Motors on Sir Syed Road off Khalid Bin Waleed Road. This is the same road that connects Khalid Bind Waleed Road to Kashmir Road, if you are coming from Noorani, go straight from 1st traffic signal that is Liberty, then turn left from 2nd traffic signal, and then again turn left in the 1st street. There's an old bungalow at the corner, from which he operates. I got my jeep checked and repaired by him (3.5l V6 GDI Petrol), expensive but good.