Hi Ron,
The OX320 compound was Acheson's Colloidal Graphite, I think DAG was another name for it. I worked in army workshops and recall, probably in late Eighties, that an Instruction was circulated, stating that the authority that tested vehicles, at the time probably Vehicles Branch at RARDE, and Alvis had come to the conclusion that this additive made no difference. I know we put it in all Alvis FV600 series vehicles, but still tracta joints would pick up. For peace of mind it might be best to continue using it though.
regards, Richard