I just always run my cars until they start to not run so good. Then I say "Time for a car payment!" And then do a major tune-up, plugs, distributor cap/rotor, air/fuel/oil/PCV filters, oil change, oxygen sensor, etc.
I also check everything else and fix anything which needs fixing or adjusting.
The exception to the above is I change oil and filter on a much more frequent regular schedule. Or if something breaks, I'll fix it of course.
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