Ford 2011 Crown Victoria Owner's Manual page 313

Every 15,000 miles Replace cabin air filter (if equipped)
(24,000 km)
Every 30,000 miles Replace climate-controlled seat filter (if
(48,000 km) equipped)
Replace engine air filter
Replace fuel filter (Crown Victoria, Grand
Marquis and Town Car)
Every 105,000 miles Change engine coolant
(168,000 km)
Replace spark plugs
Inspect accessory drive belt(s)
Every 150,000 miles Change automatic transmission fluid and filter
(240,000 km) (filter not required on 6F35, 6F50, DPS6 and
AWF-21 transmissions); consult dealer for
requirements
Change manual transmission fluid
Change rear axle fluid (RWD vehicles)
Replace accessory drive belt(s) if not replaced
within the last 100,000 miles (160,000 km)
Replace timing belt (Fiesta); failure to replace
belt can cause internal engine damage
1
Initial replacement at 105,000 miles (168,000 km) or 72 months; every
45,000 miles (72,000 km) or 36 months thereafter
2
Perform a follow-up inspection at 120,000 miles (192,000 km)
2011 Crown Victoria (cro)
Owners Guide, 2nd Printing
USA (fus)
Scheduled Maintenance Guide
1
2
313