Mercury 1996 Sable Manual page 292

If you lose the fuel cap, replace it
with one that is an authorized
Motorcraft service part or an
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, endangering you and your
passengers.
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. Using leaded fuel
is prohibited by federal law. Any vehicle
damage may not be covered by your warranty.
Octane Recommendations
Your vehicle 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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