Any thoughts on which is the superior product? The M1 Formula M 5W-40 is what Benz dealers stock for gasoline engine OC's.
http://pds.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Formula_M_5W-40.aspx
http://pds.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_Formula_M_5W-40.aspx