Rock Fork Oil

When should I change fork oil? What a lot of people don't realise is that fork oil nearly always needs to be flushed long before fork seals ever go on a bike. The fork oil works quite hard and picks up a lot of contamination from alluminium fork bushings and also dirt getting through the seals. It's difficult to answer as road and offroad differ along with their conditions but, as a rule of thumb, you should flush out motocross forks every 15 hours.