I dont think diesel will benefit from its anti ping qualities other than keeping the system nice and clean try a couple ounces. I know many guys that add kerosene to diesel for the winter to keep things flowing better but at 18:1 and more the ace tone will become self ignited so keep it to a minimum just for cleaning out the injectors may be this week Ill add 1/2 gal to a friends diesel beater truck and see what happens he already dumps waste motor oil mixed with 10% gasoline into it and it runs ok