I was given a bottle of this ZDDPlus stuff today to try. I also go a little leaflet with it that says one bottle contains twice as much ZDDP as two bottles of GM EOS. So my thinking is that half of the 4oz bottle should be more than enough per oil change for a car that needs added ZDDP.
I'm not to sure if I'll try this stuff in my drag car but I might add it to my quart of Amsoil 60 weight that I have been using for assembly lube.
