Also, don,t forget the ads that showed M1 in a frying pan, next to a pan with regular oil. As the pan heated up, the regular oil would brown up and burn up while the M1 still looked like oil.
As for the 25000 mile OCI, back around 1980, I worked for a Chemical Engineer who owned a Honda Civic Wagon. (remember those little narrow wagons?)
Well, he was a firm believer in M1. He changed his oil once a year, every spring, whether it needed it or not. Would change his filter every 8000 miles and add a little M1 to make up the difference. He normally put on 25000 miles a year, all on M1.
He loved the stuff. Don't doubt that he is still using it today.
Question. Was the M1 of back then (25000 OCI) better than the M1 of today?