You really want to do it right? Then every time you drain your oil send a sample out to get analyzed. You will then know more than you ever want to!
Excellent idea! A good lab can usually pinpoint the reason for any abnormal findings and forewarn of a possible failure situation in the making. Lot easier to replace a couple of bearings or something ahead of time than to repair a shelled engine.
Although doing it every change could get expensive.