Re: 1952 250 Mayfar 327 ci

Posted by Owen_Dyneto On 2008/8/10 22:21:40

One thing I haven't seen touched on in these discussions of the automotive motor oils of the 50s/60s were the various grade designations (before the API grades came into use). As I recall, they were ML, MM, and MS with regard to the additive packages, meaning "mostly light", "mostly medium" and "mostly severe" service. Anyone else have a recollection of this?