Yes, you are right, but tbh, I do not have any experience of buying engine oil from the twin cities; in bulk and at great discounts. But for sure, they will definitely be here, we just need to figure them out, and may be, respected members from twin cities can also help in this regard.
I visited a Shell petrol pump some weeks ago, and asked the oil change guy that from where to buy Shell lubricants; in bulk and at discount. He said that the main distributor for Shell Islamabad, has its office in I-9 somewhere. Then, there is also a shop in Gawalmandi, Rawalpindi, which offers discounts. I do not know the name of that shop or that distributor, but they can be figured out.
And similarly, we can find for other reputed brands too, simply by calling on their contact nos.
Tintin Bhai had many a times mentioned about Pakistan Oil Store, Badami Bagh, Lahore. On one of my visits to my hometown, Lahore, I went there and bought ZIC A+ 5w-20 in bulk. Now I am worry free, and no tension for next 25,000 Kms. IN SHA ALLAH.
When it will get finished, then I will think what to do?
Bro, its cleaning is reqd. as and when necessary, and not necessarily after every 50K kms. Whenever you feel drop in pick, power and fuel efficiency, get it inspected. And if its choked / clogged, get it cleaned immediately.
Right, but since I do not know about the service / maintenance history of my ride and neither do I have it, so just on a safer side and as proactive approach, I will be changing it. IN SHA ALLAH. Otherwise, rightly said. Once poured new, it can easily last 40K Kms.