A 2009 Ford Mustang V8 (4.6L or 5.4L) uses a
spin-on oil filter. However, you
cannot determine the *exact* filter part number without knowing the *specific engine* (4.6L or 5.4L) and checking your owner's manual or a parts website like AutoZone, Advance Auto Parts, or Napa Auto Parts using your VIN.
The owner's manual will give you the factory-recommended filter, and the parts websites will show you several options that are compatible. Don't rely solely on generic advice; always check your specific vehicle's requirements.