* Automatic Transmission: If your Mustang has an automatic transmission (most likely), it likely uses Mercon ATF. However, always check your owner's manual for the *specific* fluid recommendation from Ford. Using the wrong fluid can damage your transmission. The manual will specify the type and may even list specific Ford-branded fluids.
* Manual Transmission: If your Mustang has a manual transmission, it will use a gear oil, usually of a specific weight and type. Again, consult your owner's manual for the exact specification. Do not use automatic transmission fluid in a manual transmission.
In short: Don't guess. Check your owner's manual. It's the only reliable source for the correct fluid type for your specific 2002 Ford Mustang.
