Special Operating Conditions T, I, D, O, E, S

Items Needing Special Attention

If you operate your Ford/Lincoln/Mercury primarily in one of the more demanding "Special Operating Conditions" listed below, you will need to have some items maintained more frequently. If you only occasionally operate your vehicle vehicle under these conditions, it is not necessary to perform the additional maintenance. For specific recommendations, see your dealership service advisor or qualified service professional.

T : Towing a trailer or using a camper or car-top-carrier

Every 3,000 miles or 3 months Change engine oil and filter
Every 30,000 miles Change automatic transmission fluid
Every 60,000 miles Change transfer case fluid
As required Change manual transmission fluid
As required Inspect and lubricate U-joints

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

Every 3,000 miles or 3 months Change engine oil and filter
Lube front lower control arm ball joints with zerk fittings, if equipped
Every 5,000 miles Inspect brake system
Check battery electrolyte level (Patrol Cars)
Every 15,000 miles Replace fuel filter
Every 30,000 miles Change automatic transmission fluid
Lubricate 4x2 wheel bearings, replace grease seals, and adjust bearings
Every 60,000 miles Replace spark plugs
Change transfer case fluid
As required Replace cabin air filter

D : Operating in dusty conditions such as unpaved or dusty roads


Every 3,000 miles or 3 months Change engine oil and filter
Every 15,000 miles Replace fuel filter
Every 30,000 miles Change automatic transmission fluid
Every 50,000 miles Change rear axle lubricant (F-450 and F-550 only)
Every 60,000 miles Change transfer case fluid
As required Replace engine air filter
As required Replace cabin air filter

O : Off-road operation

Every 30,000 miles Change automatic transmission fluid
Every 50,000 miles Change rear axle lubricant (F-450 and F-550 only)
Every 60,000 miles Change transfer case fluid
As required Replace cabin air filter
As required Inspect and lubricate U-joints