Tech tip: To keep suspension fork seals lubed and supple, store your mountain bike upside down during extended periods of non-use.
The reason for this is that the internal components of your suspension fork include critical rubber seals, called main seals, and foam rings. Main seals retain internal fork oil and must remain lubricated for optimum performance. The foam rings are saturated with oil, which is applied to the upper tube of the fork arm as it passes through them. Without constant lubrication, the seals and rings become dry and cracked and eventually start leaking messy fork oil all over your fork stanchions and fork arms.