Right, so what you want to say is that Pak Suzuki, the actual manufacturer of Suzuki cars in Pakistan is providing false info? Though I may agree with your point that PS' documents may not be authentic, but they can always produce the required viscosity oil in Pakistan if they are producing 10W40 oil already. Why would they mislead people to such a large extent? There's a hell lot of difference between 10W40 and 0W20 oil, and by recommending a wrong oil and then giving warranty basing on the same oil isn't smart. Though PS is independent to an extent but this kind of wrong info can always be objected by Suzuki Japan!
In any case, i will wait for ur manual and see what others say.