Mobil 1™ ESP X1 0W-30 synthetic motor oil has been expertly engineered to help prolong the life and maintain the efficiency of emission systems in both diesel and gasoline powered automobiles. Formulated to be fully compatible with the latest Diesel Particulate Filters (DPF's) and Gasoline Catalytic Converters (CAT's), it replaces Mobil 1™ ESP Formula M 5W-40 and Mobil 1™ ESP 0W-30.
In the Product Guide it says, "SN Engine Test Requirements". Take that for what it's worth.
If you look at the relative performance tool at:
http://lubrizol.com/apps/relperftool/pc.html API SN doesn't remotely compare to the performance level of 229.52. Nor does GF-5 with the exception of Catalytic converter protection and economy.
Seems the european OEM's look at engine oil differently than Asian, or American OEM's.