[2001 ZTS]

Here we go:

Which Maintenance Schedule is Right for You?

The normal maintenance schedule of 6 months or 10,000 km applies to those who operate their vehicle under typical,everyday driving conditions. The listed services should be performed at specified distance or time intervals. Items listed in "Special Operating Conditions"and "Additional Maintenance Requirements and Information" are services that only the noted vehicles and situations require.

Special Operating Conditions

Off-road use.
You tow a trailer or use a camper or car-top carrier.
Most trips include extensive idling (such as frequent driving in stop and go traffic).
You carry heavy loads.
Your vehicle is used for delivery service, police, taxi or other commercial application.
You operate in dusty conditions such as unpaved or dusty roads.
You operate the vehicle off-road in water that is deeper than the hubs (1 /2wheel height) or in extremely muddy conditions. Affected components must be serviced daily.
If your vehicle is equipped with a Vehicle Maintenance Monitor (VMM),change oil and filter when indicated by VMM,but do not go beyond 6 months.

If you primarily operate your vehicle in any of the more demanding “Special Operating Conditions” listed above, perform oil and filter changes every 3 months or 5,000 km and automatic transmission fluid and filter changes every 30 months or 50,000 km. Replace fuel filters every 20,000 km, transfer case fluid every 100,000 km, platinum spark plugs every 100,000 km and PCV valve every 100,000 km.

NOTE: If you only occasionally operate your vehicle in these conditions, it is not necessary to perform this additional maintenance.

Copyright  2004 Ford Motor Company of Canada, Limited. All rights reserved.


http://www.ford.ca/english/Maintaining/c.../011_2.asp

Remember it is your dealer who want's you in every three months, it is how they make their money. ;)