More Heavy Trolling by Senile Nym-Shifting Rodent Speed!
The Army used to actually sample oil, under the Army Oil Analysis Program. They checked for metal contaminants and breakdown of additives, I guess, and changed oil based on test results rather than time.
I haven't had contact with that section in years and don't know if they still do it, and obviously that's not practical for the homeowner, but it is one way of doing it.
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