"O" - Off-Road Operation

SPECIAL OPERATING CONDITION "O" - Off-road operation

EVERY 5,000 MILES Change engine oil and replace oil filter
Rotate tires, inspect tires for wear and measure tread 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 transmissions)
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
Inspect and lubricate steering linkage ball joints and U-joints (if equipped with zerk fittings)