Ford Mustang (1999-2004) Service Manual: Special Operating Condition Requirements

When towing a trailer or using a camper or car-top carrier:

• Change engine oil and install a new oil filter every 4,800 km (3,000 miles) or 3 months.
• Change transfer case fluid every 96,000 km (60,000 miles).
• Change manual transmission fluid as required.
• Inspect and lubricate U-joints as required.

During extensive idling and/or low speed driving for long distances, as in heavy commercial use such as delivery, taxi, patrol car or livery:

• Change engine oil and install a new oil filter, lube front lower control arm and steering linkage ball joints with zerk fittings (if equipped) every 4,800 km (3,000 miles) or 3 months.
• Inspect brake system and check battery electrolyte level (Patrol cars) every 8,000 km (5,000 miles).
• Install a new fuel filter every 24,000 km (15,000 miles).
• Change automatic transmission fluid, lubricate 4x2 wheel bearings, install new grease seals and adjust bearings every 48,000 km (30,000 miles).
• Install new spark plugs and change transfer case fluid every 96,000 km (60,000 miles).
• Install a new cabin air filter as required.

When operating in off-road conditions:

• Change automatic transmission fluid every 48,000 km (30,000 miles).
• Change transfer case fluid every 96,000 km (60,000 miles).
• Install a new cabin air filter as required.
• Inspect and lubricate U-joints.
• Inspect and lubricate steering linkage ball joints with zerk fittings.