These additives were made separately and not formulated in a finished product for a reason. And if one takes a few moments to think about it, over the life of an engine, you may never come to see their "theoretical" potential of "wear reduction" realized on the ground, add to that the cost that will not be anywhere near effective and worthwhile to justify the subjective observations of "smooth" and "quiet". Disturbing the chemical balance of a formulation is a wrong practice that will more than likely offset the cost paid to satisfy a couple of subjective observations that many good oils are more than capable of achieving on their own without help.