i feel active 4t extra 20w 50 is better than Power 1 ( regular not synthetic) any given day ...
I will not touch any other synthetic oil other than Motul or Petronas cause both are NOT MADE IN INDIA

the sound looks be from chain as when u press clutch the engine noise reduces and you can hear chain's movement , get it cleaned and lubed asap...
Its true that r15 powerband starts at 6k mark , below that its just a regular 150cc








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