Brother I would suggest thorough regular maintenance of your vehicle (Koi pata nai, isski last time preventive maintenance kab Hui ho? Ya kafi arsay sey Hui b Hai k nai?)
Get it scanned through computer for detailed diagnosis, and if you want Total package, get your vehicle inspected by Pak wheels car inspection team. They will thoroughly inspect your vehicle and give you all the details of work required to be done and the problems found (transmission (if any), brakes, etc.)
RS. 2000 kharcha aye ga, but it's worth spending And Iss tarha sey AAP local mecahnics k jougaru programs sey bach jyein gey.
If your engine is in pristine condition, I would suggest 5w-30 (or max. 5w-40) API SN fully Synthetic Engine Oil from any well reputed brand, but make sure that the oil is 100% genuine and original. And do that after complete engine flush.