Grade is nearly irrelevant with those approvals, really who cares. Every one of them that carries the actual Mercedes-Benz approval has been proven to pass the myriad of tests Mercedes-Benz requires, including wear.
The only "deal" with Mobil 1 0W-40 is that it has the approvals, certifications and licenses as listed. So do other brands and other grades.
The only "deal" with Mobil 1 0W-40 is that it has the approvals, certifications and licenses as listed. So do other brands and other grades.