Here's a link to the AC Delco site; http://www.acdelco.com/html/pi_vehcare_lub.htm

Use the drop down menu, choose EOS assembly lubricant to get to 10-106. In the description it doesn't give any indication as to the ZNDP (which is the additive that drives the desire for this type material additive), but it does say it isn't intended as a lubricant additive. It could be that it doesn't stay in suspension in it's current formulation.