The premise of this thread is rather funny. PP and PUP 5W30 meet A5/B5 yet M-1 does not in 5W30.
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_5W-30.aspx
http://www.mobil.com/USA-English/Lubes/PDS/GLXXENPVLMOMobil1_5W-30.aspx