We recommend shock service every 100 hours of riding time or annually to stay in top working performance. If you have exceeded this usage recommendation and are experiencing any performance decline, visible oil leakage, noises, etc., then it is time for a service either from us directly or an authorized service center.  Preventative maintenance, especially in the off-season/rainy season, is highly recommended to keep you on the trails when the riding is good rather than having to deal with an unplanned service.