Hello, I'm joy from kolkata. I've a problem with my hero honda cbz xtreme 2012 model without kick starter. I've used the hh OEM 10w30 engine oil for first 1k kms. Then I changed it with castrol power 1 racing fs 10w50 oil. Bike lacks its initial pick up with this oil. But engine sounds very low. Then I switched to honda OEM engine oil 10w30. Bike became so smooth but engine became noisy. Recently its 15k in the odo and I'm using motul 5100 15w50 and bike lacks pulling power and engine is noisy. Plz suggest me what to do to get rid of this. Should I stick to the grade that manufacturer recommend?Thanks a lot in advance.