Octane Recommendations - Ford TAURUS 2013 Owner's Manual

Fuel and Refueling 191
It is best not to alternate repeatedly between gasoline and E85.
If you do switch fuels, it is recommended that you add as much fuel
as possible—at least half a tank. Do not add less than five gallons
(18.9 liters) when refueling. You should drive the vehicle immediately
after refueling for at least 5 miles (8 kilometers) to allow the vehicle
to adapt to the change in ethanol concentration. If you exclusively use
E85 fuel, it is recommended to fill the fuel tank with regular unleaded
gasoline at each scheduled oil change.
Your vehicle was not designed to use fuel or fuel additives with metallic
compounds, including manganese-based additives. The use of leaded fuel
is prohibited by law.

Octane recommendations

• 3.5L V6 engine
87
(R+M)/2 METHOD
"Regular" unleaded gasoline with a pump (R+M)/2 octane rating of 87 is
recommended. Some stations offer fuels posted as "Regular" with an
octane rating below 87, particularly in high altitude areas. Fuels with
octane levels below 87 are not recommended.
• 3.5L V6 SHO/2.0L EcoBoost® engines
"Regular" unleaded gasoline with a pump (R+M)/2 octane rating of 87 is
recommended. Some stations offer fuels posted as "Regular" with an
octane rating below 87, particularly in high altitude areas. Fuels with
octane levels below 87 are not recommended. Premium fuel will provide
improved performance and is recommended for severe duty usage such
as trailer tow.
Do not be concerned if your engine sometimes knocks lightly. However, if
it knocks heavily while you are using fuel with the recommended octane
rating, see your authorized dealer to prevent any engine damage.
2013 Taurus
Owners Guide gf, 3rd Printing, December 2012
USA (fus)