They are ruining our engines with thick oil.
Recently I replaced my wife's Alto first engine oil with 0w-20 and it made heck of a difference. Engine noise is slightly reduced. Vehicle starts with less cranking and acceleration and fuel economy is also slightly better now.
They forced me to use thick oil but instead of going in debate with them, I convinced them that my vehicle is not driven more than 2 or 3 km per trim
and they agreed to put 0w-20.