Separate names with a comma.
But this is depend on the car u drive, some of the car suit ron97 but some of the car doen't suit ron97
so it's wasting money if u pump the...
petronas always be my first choice since I got my driving license...
I had mixed these 2 fuels at the same time,my car still perform well,nothing happen,so u x need worry too much.
Although other petrol also have this function but I think they can't even compare with shell hehe
If u ask me,I think shell is the best among these fuel brands.I can feel more power behind the wheel after filled with shell's petrol.