Shell advance ultra 10w-40 fully synthetic
price =810 pkr
Mobil 1 4T fully synthetic 10w-40
Price =2550
Liqui moly 10w-40 semi synthetic
Price =1450
Fully synthetic base oils are best, as they have more additives for engine care, also never creats sludge in engine, and normally have 3 times better interval life than conventional or miniral based oils
Personally i prefer shell because of its quality and price range and it is "superb"
API SN Jaso MA2 is best oil standard for bike
Also 10w-40 has better oil flow than 20w-50 even 10w-40 support more extreme cold weather conditions than 20-50