FWIW
The Petroleum Quality Institute of America
Most if not all of the passenger car motor oils tested have less than the 1200 ppm Zn required. Most of the HD diesel oils fall around 1,200 ppm. What's the big deal about Brad Penn?
Rotella T Triple (1,098 ppm Zn)
http://www.pqiamerica.com/May%202013/rotella.htm
Brad Penn "Diesel" (1,148 ppm Zn)
http://www.pqiamerica.com/May%202013/bradpenn.htm
Chevron DELO (1,490 ppm Zn)
http://www.pqiamerica.com/May%202013/chevrondelo.htm