Ford 1996 Contour Manual page 201

NOTE: If you spill any fuel on the body of your vehicle,
clean it off immediately. The fuel may dull or soften
the paint if you do not wash it off.
Replace the fuel cap completely when you are finished. Turn
3.
it clockwise until it is tight. It will click when it is fully
tightened.
Push the fuel door closed.
4.
If you lose the fuel cap, replace it with an authorized Motorcraft
or equivalent part.
If you do not use the proper fuel cap, the pressure in the
fuel tank can damage the fuel system or cause it to work
improperly in a collision.
NOTE: If you replace your fuel cap with an aftermarket fuel
filler cap, the customer warranty may be void for any
damage to the fuel tank and/or fuel system.
Choosing the Right Fuel
Use only UNLEADED FUEL in your vehicle. Using leaded fuel
is prohibited by federal law. Your warranty may not apply if
your vehicle is damaged because you used the wrong fuel.
Using a high-quality fuel makes your vehicle more responsive
and maintain its good fuel economy and emissions. It should
not be necessary to add any aftermarket products to your fuel
tank if you continue to use a high-quality fuel.
Octane recommendations
Your engine is designed to use regular fuel with an octane
rating of 87. In most cases it is not necessary to use a fuel with
an octane rating higher than 87. At service stations, the octane
rating is displayed in a label on the pumps.
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