Which engine oil is best for our bike?

Yellow coloured certificate was for Castrol Power Cruise 20w50 engine oil. I completed only 1900 kms on this engine oil and that was top performance for this oil then changed to bajaj oil. White coloured certificate is for Bajaj DTS-SI 20w50 hp made engine oil. My riding experience with castrol power cruise in Discover 125 BS4 model is very uncomfortable. After changing back to manufacturer recommended Bajaj DTS-SI 20w50 the bike is working like rocket and comfort is too good even after crossing 3000+kms. Cover topics: best engine oil best engine oil for bike engine oil which oil is best for bike engine? best engine oil for bike in winter best engine oil for bikes best engine oil for motorcycle best engine oil for your bike engine oil grade bike engine oil best engine oil for bike scooter in 2021 secret tips which is best engine oil for bike best synthetic e