Ford Crown Victoria 2011 Owner's Manual page 326

Scheduled Maintenance
If operating conditions are normal and you drive your vehicle under typical, everyday conditions and you are using an API
performance category oil of SL or later (for example SM, etc.) then you can follow the 7,500 mile (12,000 km) normal
service oil change intervals schedule. Vehicles operating in the Middle East, North Africa, Sub-Saharan Africa or locations with
similar climates must follow the oil change interval of 3,000 mile (4,800 km) if the owner is using oils defined by the
American Petroleum Institute (API) performance category of API SK or earlier (for example SJ, etc.).
Edge/MKX AWD only – vehicles operating off-road in sand during high ambient temperatures must replace the AWD
PTU (All-wheel drive Power Transfer Unit) lube every 20,000 miles (32,000 km).
Engine air filter & cabin air filter replacement
Engine air filter and cabin air filter life is dependent on exposure to dusty and dirty conditions. Vehicles operated in these
conditions will require frequent inspection and replacement of the engine air filter and cabin air filter.
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2011 Crown Victoria (cro)
Owners Guide, 3rd Printing
USA (fus)
Middle East hot climate specifications