Because fresh shock oil makes better shocks! Over time, contaminates can murky up your shock juice causing inconsistent damping which means poorer shock performance. Some hardcore racers change their oil after every run or two; others leave it for weeks or even months. Average racers should do it every few race days. However, if you’re a big setup guy and are altering suspension settings all the time anyway, you’ll often have new oil in your shocks by default as you test different viscosities. If you haven’t done an “oil change” in a while, get to it!
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