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Depends on the coilover and the usage.
More frequent rebuilds on motorsports coilovers due to lower drag seals, more intense usage, and the fact that you'd want them to be in tip-top shape all the time.
40k miles is a pretty good run for a street and light track coilover. We do often see longer than that with our stuff but at 40k I recommend starting to take a close look at them more frequently.
It's important to note that even without leaks the fluid can degrade.
I tend to give everything a nice inspection and cleaning at the beginning and end of winter. Be sure you're not cleaning with a solution that will damage the finish. Just wipe em down good.
- Andrew
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