Ford 1996 Crown Victoria Manual page 311

Lubricate all hood, door and trunk lid hinges
and latches with a light grade oil.
Cover interior soft trim to prevent fading.
Keep all rubber parts free from oil and
solvents.
Engine
Start engine every 15 days. Run at fast idle
until it reaches normal operating temperature.
With your foot on the brake, shift through all
the gears while the engine is running.
Fuel system
Fill fuel tank with high-quality unleaded fuel
until the first automatic shutoff of the fuel
pump nozzle.
NOTE: During extended periods of vehicle
storage (60 days or more), fuel may
deteriorate due to oxidation. This can
damage rubber and other polymers in
the fuel system and may also clog
small orifices.
Ford Gas Stabilizer should be added whenever
actual or expected storage periods exceed 60
days. Follow the instructions on the label. The
vehicle should then be operated at idle speed to
circulate the additive throughout the fuel system.
Cooling system
Protect against freezing temperatures.
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