I am not sure if this is common knowledge but was news to me.
I came across this as my Veloster Turbo is having some pinging esp when it is very hot outside. Now I am using the Pennzoil synthetic oil that claims would be compatible with this specs come May 2020.
My issue goes away with 89 Octane fuel. I think Hyundai just has to change the fuel recommendation on this engine. But I found the new oil spec interesting.