That manual is printed by Pak Suzuki, and it has typos in the maintenance schedule as well 
Suzuki Japan recommends 0W-20 for R06A engine and 5W-30 for the same engine with turbocharger.
Turbo engines produce lot more heat than the NA. Even for the turbo they are recommending 5W-30.
I don't know how Pak Suzuki came with this magic grade.
I suggest try using 0W-20. You will thank us later.