I think you misunderstood the discussion. It was my discussion, and I was trying to explain the fuel economy benefits. What I meant was if you drive on long, the fuel economy difference between 0W-20 and 5W-30 is negligible. I was not comparing 0W-20 with 10W-40.
As xenerking mentioned, there's no such thing. I am using 0W-20 in my 2019 model Alto from day 1, and I did one trip from Islamabad to Karachi with that oil. The car is still running fine. No issues so far Alhamdulilah.