There are a lot of discussions out there about this.
One thing I spotted was that MMO is a solvent and Lucas is a lubricant. I don’t know how true this is. Also read where MMO does not “burn” completely. Also, do not know how true.
I am interested in using an additive to maintain a healthy Ford 226 (c.i.d.) Rouge “Flathead” in my 1949 Ford F-1 pick-up. Mainly looking for the upper cylinder lube and lead substitute.
I also will use an additive in my 1996 Jeep Cherokee with 4.0 L in-line 6. This is a daily driver with 150,000 miles.
I have always been a Lucas fan, but I’m taking a hard look at MMO. I need the “push.”