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Ralph Mowery

In article , says...

The right way would be to do an oil analysis every X miles. Driving
conditions vary so much we'd all be on different schedules for changes.

We used to do that with hydraulic units on the machines. Cheaper to pay
for an analysis than replace 55 gallons of oil that is still good.

for big machines and maybe a fleet of vehicles, but for a single car, it
would probably cost way more to test it than just change it and the
filter.