guys i would suggest that using a 3000 Rs/Litre oil in a shoppers basic buggy like a vitz is surely an overkill.
using toyota own recommended oil is the best and costs drastically lesser tan totachi or amsoil and works for a lower fuel grade, higher temperature conditions and recommended change intervals.
so please dont fight over it. it all depends upon the buying power of the customer and considering the application recommending a reasonable oil (both in terms of performance and cost) is obligatory upon more learned members.