According to ExxonMobil's oil-comparison tool, the only "all-four-star" Mobil 1 oils are Mobil 1 FS 0W-40, Mobil 1 FS X2 5W-50, and Mobil 1 ESP X1 0W-30. These oils are all European formulations. Note that Mobil 1 0W-40 has been permanently replaced by Mobil 1 FS 0W-40, which is very similar but thinner to be more fuel-saving.
So, you aren't getting an all-four-star Mobil 1 oil unless you are buying one of these three. Chances are that their viscosities are too thick for your engine-manufacturer's specs unless you own a European car or an old car. Always check your other oil requirements before using any of these.
https://mobiloil.com/en/product-catalog
So, you aren't getting an all-four-star Mobil 1 oil unless you are buying one of these three. Chances are that their viscosities are too thick for your engine-manufacturer's specs unless you own a European car or an old car. Always check your other oil requirements before using any of these.
https://mobiloil.com/en/product-catalog