What Preventative Maintenance is Needed on a New Edge Mustang? | MotorBiscuit

The SN95 chassis was one of the Mustang’s longest-lasting generations. Towards the end, in 2004 there were very few recalls, and almost all had to do with aftermarket lamps. Owners consider the 4.6-liter engine as one of the most reliable engines Ford has ever built, though they weren’t without problems. That said, there are some preventative maintenance owners can do to elongate their Mustang GT’s life. Most of it is simple and cheap, while some of it may require a couple of jack stands and some elbow grease. Staying on top of this maintenance can ensure a 4.6-liter will last to 300,000 miles.

Change the PCV valve every 30,000 miles

2003 Ford Mustang Mach 1 on display in New York | STAN HONDA/AFP via Getty Images

A common point of maintenance with the 4.6-liter is its positive crankcase ventilation (PCV) valve. An engine’s crankcase produces gasses from burned fuel, so the PCV valve reroutes those gasses back into the combustion chambers. Before the PCV valve, those gasses were routed to the exhaust. The PCV valve is part of an engine’s emissions equipment. Prices can range from $10 for an aftermarket one or $50 for an OEM Motorcraft part. It can be found screwed into the passenger side valve cover with a hose attached. 

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