Bro,
Brand is not important but this is more important you buy from a Trust able Oil dealer in your city and refill the oil with clean gadgets, for example; Follow following Safety Precautions
1- For Engine oil completely Drain the oil for 15 minutes, install new and genuine oil filter, clean the drain plug before installation and refill the new oil in your presence with a clean Funnel.
2-For gear oil, Fill gear oil with a clean and pre flushed oil pump.
Myself used Havoline Gear Oil SAE-80W-90 API GL-4 (two litres)
and Shell HX5 10W-40 (4 litres)
Gear shifting is smooth Masha Allah up till now.
Baqi log Zic, Toyota Gear Oil and Liqui moli gear oil bhi use kerwa rahay hain. koi issue nahi aata. Engine oil ke liye log Total, Shell, liquimoli wagera use ker rahay hain.
Engine oil Synthetic wala ziada behter hota hai magar wo thora expensive hota hai jitna mehnga utna acha
Use following blog for your better understanding of Engine Oils. Aur iss ke mutabiq Shell HX7 new car kay liye ziada behter hai.
https://www.pakwheels.com/blog/oil-guide/