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Exactly as pointed out above, it can be quite variable based on a number of factors. And time is the variable that creeps up on everyone.
As a good example I've got a set of custom Ohlins WRC dampers fitted, and the factory recommendations are-
Service after:
Smooth gravel (max working temp 90c) 800km (497 miles)
Medium gravel (max working temp <110c) 700km (437 miles)
Rough gravel (max working temp >110c) 350km (217 miles)
Tarmac 1000km (621 miles)
But being on a road car, Ohlins said they were comfortable (if kept fairly clean, and running with "socks") with around 10-15Km or 1.5 to 2 years.
In reality in a full competition WRC car the dampers are replaced at every service interval...thats around 100km or so, or 2 to 3 times per day!
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