"T" - Towing A Trailer or Using A Camper or Car-Top Carrier

Every 3,000 miles or 3 months - Change engine oil and replace oil
filter.

Every 30,000 miles - Change automatic transmission fluid.
- Lubricate 4X4 front hub needle bearings (F Super Duty)

Every 60,000 miles - Change transfer case fluid.

As required - Change manual transmission fluid.

As required - Inspect and lubricate U-joints.