Mobil One (the only synthetic to use IMHO) does not sell a 5W40. I know the 0W40 is approved for my '15 VW Golf TSI (gas) but the Owners Manual recommends 5W40.
I could ask "why doesn't Mobil market 5W40 Mobil 1," but the real question is what are the advantages of either grade? I live in Northern Wisconsin, where lows can get down to -25 degrees, while high temps reach the mid-high 90's in the summer.
I could ask "why doesn't Mobil market 5W40 Mobil 1," but the real question is what are the advantages of either grade? I live in Northern Wisconsin, where lows can get down to -25 degrees, while high temps reach the mid-high 90's in the summer.