Ford Mustang Owner's Manual page 340

Scheduled Maintenance
Example #1: The OIL CHANGE REQUIRED message comes on at
28,751 miles (46,270 km); perform the 30,000 mile (48,000 km)
automatic transmission fluid replacement.
Example #2: The OIL CHANGE REQUIRED message has not come on
but the odometer reads 30,000 miles (48,000 km); perform the engine air
filter replacement. (i.e., Intelligent Oil Life Monitor™ was reset at
25,000 miles [40,000 km].)
Operating in dusty conditions such as unpaved or dusty roads
Inspect frequently,
service as required
Every 5,000 miles
(8,000 km)
Every 5,000 miles
(8,000 km) or
6 months
Every 50,000 miles
(80,000 km)
Reset your Intelligent Oil Life Monitor™ after each engine oil and filter
change; refer to the Instrument Cluster chapter
Exclusive use of E85 (Flex Fuel Vehicles only)
Every oil change
340
2012 05+ Mustang (197)
Owners Guide, 3rd Printing
USA (fus)
Replace cabin air filter (if equipped)
Replace engine air filter
Inspect the wheels and related components for
abnormal noise, wear, looseness or drag
Rotate tires, inspect tires for wear and measure
tread depth
Change engine oil and filter
Change manual transmission fluid
If ran exclusively on E85, fill the fuel tank full
with regular unleaded fuel