Here's more reading from experts on the subject.
Blackstone Labs | A Brand New Perspective: Digging Into the Timeless Question, “Which Oil is Better?”
View my fuel log 2015 Mirage ES 1.2 manual: 49.9 mpg (US) ... 21.2 km/L ... 4.7 L/100 km ... 59.9 mpg (Imp)
I'm now no longer concerned about using Petronas oil.
I have delved deeper into Petronas, it's Malaysian, they have worked in conjunction with Mercedes F1 racing team, but I'm sure at some point in the past Petronas was something to do with the Fiat empire.
I am sticking with recommended 0W-20, & I highly doubt any 0W-20 product would be bad. They are all rated pretty much the same. Since switching to synthetic oils in my vehicles, I like using a decent oil filter, too. It doesn't seem to be a delicate engine @ all!