Most aftermarket coilovers are rebuildable. Revalving is not consider rebuilding, but it is recommended that the cores are rebuilt at the same time. I have never owned a set of aftermarket, adjustable coilovers, so I have no idea of their life-to-maintenance span. Environmental effects like temps, humidity, salinity, sand, dirt, corrosion can contributers to life expectancy. The main contributor, though, is driving style and the typess of terrain. Straight, flat, and easy driving will net more mileage out of a set of struts/shocks more than hard cornering or off-roading will. The more exercise, the less the life.
Did you know that every tC comes with front/rear coilovers already? Of course, they have only one adjustment... remove.
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