I've a Honda shine 2011 purchased second hand. On the day of engine oil change the engine runs smooth as butter. When days roll, the piston sound and the rotating parts sound are a level up and audible whenever I ride. Also, the sound would be smooth during the first few minutes of everyday ride. Then happens the sound change.

As I'm a concerned with NO- noise ride, requesting some advice on this.

The bike had been run on shell 10w30 when i purchased it. Thinking that the oil might be too thin which is making this noise, I started using 20w40 for the past one year. The noise got a bit reduced yet could be heard distinctively on riding with a helmet. I've also tried engine lubricant additive from X1R, yet that works only for a few days.

Any suggestion on this pls.