Ford 2003 Mustang Workshop Manual page 31

Exceptions To Normal Schedule
Yellow Coolant
Change coolant at 5 years or 160,000 km (100,000 miles) of the vehicle's life, whichever comes
first.
After the initial change, change coolant every 3 years or 80,000 km (50,000 miles) thereafter.
Natural Gas and Propane Vehicles
Inspect NGV fuel tanks from the date of tank manufacture every 3 years.
Inspect propane fuel tanks from vehicle build date every 5 years.
Install new NGV fuel tanks from the date of tank manufacture every 15 years.
Normal Vehicle Axle Maintenance
Rear axles and power take off (PTO) units containing synthetic lubricant and light duty trucks equipped
with Ford-design axles are lubricated for life. These lubricants are not to be checked or changed
unless service is required, or if a leak is suspected, or the axle assembly has been submerged in
water.
The axle and PTO should be changed anytime they have been submerged in water. Non-synthetic
rear axle lubricants should be replaced every 4,800 km (3,000 miles) or three months, whichever
occurs first, during extended trailer tow operation above 21°C (70°F) ambient and wide open throttle
for extended periods above 45 mph.
The 3,000 mile lube change interval may be waived if the axle was filled with 75W140 synthetic gear
lubricant meeting Ford specification WSL-M2C192-A, part number F1TZ-19B546-B or equivalent. Add
four ounces of additive friction modifier C8AZ-19B546-A (EST-M2C118-A) or equivalent for complete
refill of Traction-Lok rear axles.
The axle lubricant should be changed anytime an axle has been submerged in water.
Police and Taxi Vehicle Axle Maintenance
Replace rear axle lubricant every 160,000 km (100,000 miles). Rear axle lubricant change may be
waived if the axle was filled with 75W140 synthetic gear lubricant meeting Ford specification WSL-
M2C192-A, part number FITZ-19580-B or equivalent. Add four ounces of additive friction modifier
C8AZ-19B546-A (EST-M2C118-A) or equivalent for complete refill of Traction-Lok rear axles.
The axle lubricant should be changed anytime an axle has been submerged in water.