i can understand that higher the viscosity, more will be the damping effect of the oil, and consequently lesser noise, but when we say "smoother" it means lesser vibrations, which is only damped by higher viscosity.
is there anything else to it?
because if viscosity is the only reason, then might as well go in for the maximum viscosity the bike can handle safely for the particular climate, and be done with it.
this is not a synthetic vs mineral debate, but i do know synthetic oils are superior to minerals...


. reminds me of the song "Non sense ki night(All is in the well when end is in the well..)"
).

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