Take a look at the Valvoline VR1 Racing and Not Street Legal oils. They has the high levels of Zinc and Phos needed. I ran this by Marc and agreed they would work. Just another alternative for us. I will be trying the 10/30 on my next oil change.
Valvoline VR1 Racing Oil contains .13% of Zinc and .12% of Phosphorus
http://www.valvoline.com/products/consumer-products/motor-oil/racing-motor-oil/6
Valvoline "Not Street Legal" Racing Oil which contains .14% of Zinc and .13% of Phosphorus
http://www.valvoline.com/products/co...ng-motor-oil/9