Ford on WSS-M2C929-A vs WSS-M2C946-A

[volk06]

Hello Volk06,

This is Jamie again from Ford's Customer Relationship Center. Thank you for writing back to us and for your patience while we escalated your inquiry to a Technical Subject Matter Expert.

According to their resources, the WSS-M2C946-A oil specification is the newer specification that replaces the WSS-M2C929-A specification. It will be the proper engine oil engine oil to use with the WSS-M2C946-A specification.

I hope the information I provided helps. Thank you for contacting Ford Motor Company.

Sincerely,
Jamie
Customer Relationship Center
Ford Motor Company

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[volk06]

This is exactly what most everyone has said and we finally have some proof to back up the nay sayers.

 

[Izb]

WSS-M2C946-A may be only API SN.
WSS-M2C929-A may be API SL/SM

I like API SL (max Zinc=1200ppm)!

 

[Klutch9]

Yes, the 946 spec simply replaces the 929 one for 5w-30. I think the 946 spec came out when SN oils did, and the 929 was associated with SM or SL oils. Ford did the same thing with 5w-20, as the 945 spec replaced the 930 spec. You still see some new SN oils that also list the old/outdated specs on the bottle along with the new ones, but this is redundant, since the newer specs supersede the older ones for usage and warranty purposes.