I just bought 5W-30 Mobil 1 European car formula for my son's 2011 Audi A3 2.0 it has 60k miles.
I also bought the same Mobil 1 European car formula but 0W-40 for my 2016 Mini Cooper with a 1.5 with 38k miles.. Maybe I should exchange the 0W-40 for 0W-30?
Both oils have the correct...
