Vehicle fluids are designed to protect the systems that they run within. One of the main maintenance items on your vehicle is to keep those fluids clean, full, uncontaminated, and at the proper protection level.
Preventative maintenance is:
Preventative maintenance would be repairing the cause of any fluids seeping before they are leaking and causing a low-level issue. Preventative maintenance is really the key to the safety, reliability, and longevity of your vehicle.