I own a bullet classic 350 and I was using Motul 5100 in it. When it was time to change I thought I’ll try Castrol which mentioned it was designed for Bullet especially. I must say, I was not too impressed with it. The engine felt rough and acceleration was not great. I reverted back to Motul 5100 and things are great again. I’m not saying Castrol is bad, I feel it’s just not for this bike.
With Motul in the engine, acceleration has become smooth, vibrations are lesser and feel power is available when demanded.