"O" - Off-Road Operation

SPECIAL OPERATING CONDITION "O" - Off-road operation

Every 5,000 miles or 6 months - Change engine oil and replace oil filter
- Rotate tires, inspect for wear and measure depth
- Inspect the wheels and related components for abnormal noise, wear, looseness, or drag

Every 30,000 miles - Change automatic transmission/transaxle fluid (not required on 6R60/6R75/TorqShift transmission)
- Replace wheel bearing grease and grease seals on 4x2 front wheel bearings (if non-sealed bearings)

EVERY 50,000 MILES - Change manual transmission fluid
- Change rear axle lubricant (E450 and F450/550 only)

EVERY 60,000 MILES Change transfer case fluid

AS REQUIRED Replace cabin air filter (if equipped).

AS REQUIRED Inspect and lubricate steering linkage ball joints with zerk fittings.