I don’t see any reason to base the inspections on anything but mileage. My Z4MC has had the valves “adjusted” every 15k mi, and no shims were needed on the last 2. So lots of time and money to learn “it’s all good!”
Now, certainly fluids (brake, oil, coolant) can warrant replacement based on time, but pretty much everything else is most rationally tied to mileage.
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