Replacing your 1994-04 Mustang's PCV valve is recommended every 50,000 miles. These valves can become clogged over time, preventing blow-by from being re-burned in the combustion chamber. This can build up engine sludge and be very harmful to your Mustang's motor. We also carry hoses, filter screens, and grommets to complete your install. Get your replacement today at LatemodelRestoration.com!