The manual says to change it every 150K miles, but later it also says that it never needs to be changed.
150,000 miles
❑ Change engine oil and replace oil filter.
❑ Inspect tires for wear and rotate.
❑ Inspect brake pads/shoes/rotors/drums, brake
lines & hoses, and parking brake system.
❑ Inspect wheel ends for endplay and noise.
❑ Inspect engine cooling system and hoses.
❑ Change Premium Gold coolant (see exceptions
page 45 and record page 47).
❑ Inspect exhaust system and heat shields.
❑ Inspect steering linkage, ball joints, suspension
and, if equipped, half shafts, driveshaft and
u-joints.
❑ Replace engine air filter (except PZEV Focus see
below).
❑ Check air filter minder, replace filter as required
(Focus PZEV engine).
❑ Replace fuel filter (see page 46).
❑ Replace cabin air filter, if equipped.
❑ Change automatic transmission/transaxle fluid
and filter.
❑ Change rear axle lubricant on all rear wheel
drive (RWD) vehicles (see pages 45 and
46).
❑ Replace accessory drive belt(s) (if not replaced
within last 100,000 miles).
❑ Replace climate-controlled seat filters (LS,
Freestar, and Monterey) if equipped.
❑ Inspect fuel tanks (natural gas only).
❑ Drain coalescent fuel filter bowl (natural gas
only).
❑ Clean injectors (natural gas only).
❑ Multi-point inspection (recommended)
Page 46
Rear axles and power take off (PTO) units containing synthetic lubricant and light duty trucks equipped
with Ford-design axles are lubricated for life. These lubricants are not to be checked or changed unless
a leak is suspected, service is required or the axle assembly has been submerged in water. The axle
and PTO lubricant should be changed anytime the axle and PTO have been submerged in water