a VG (V-6) engine trouble shooting to a common street side 'Specialist' ustaad will be a Pratt & Whitney F100 engine trouble shooting by motorbike mechanic.
if your vehicle is functional running better choice is as mentioned in post #4 Jameel Autos. he can perform compression test and get you an exact picture of engine condition.
do not use engine oil above 10W-40 best will be 5W-30, after compression test.
climate control & electricals can be fixed by any seasoned electrician whose birthday is before the vehicle model.
the rear screen sand blast etching of vehicle regn was phenomena of early 90's in Sindh. single alphabet & 4 digits.
Plates are of ICT 