Ford Crown Victoria 2011 Owner's Manual page 318

Scheduled Maintenance
SPECIAL OPERATING CONDITIONS
If you operate your vehicle primarily in one of the more demanding
conditions listed below, you will need to have some items maintained
more frequently. If you only occasionally operate your vehicle under
these conditions, it is not necessary to perform the additional
maintenance. For specific recommendations, see your dealership service
advisor or technician.
Towing a trailer or using a camper or car-top carrier
Inspect frequently, service as
Every 5,000 miles (8,000 km) – Inspect wheels and related components for abnormal
Every 5,000 miles (8,000 km) or
Every 30,000 miles (48,000 km) – Change automatic transmission fluid (except 6R80
Every 60,000 miles (96,000 km) – Change manual transmission fluid
318
2011 Crown Victoria (cro)
Owners Guide, 3rd Printing
USA (fus)
– Inspect and lubricate U-joints
required
– See axle maintenance items under Exceptions
noise, wear, looseness or drag
– Rotate tires, inspect tires for wear and measure tread
depth
– Change engine oil and filter
6 months
– Inspect and lubricate U-joints
transmission)