Ford SUPER DUTY 2023 Owner's Manual page 219

For best overall vehicle and engine
performance, premium fuel with an octane
rating of 91 or higher is recommended. The
performance gained by using premium fuel
is most noticeable in hot weather as well
as other conditions, for example when
towing a trailer. See Towing a Trailer
(page 365).
Do not be concerned if the engine
sometimes knocks lightly. However, if the
engine knocks heavily while using fuel with
the recommended octane rating, contact
an authorized dealer to prevent any engine
damage.
We recommend Top Tier detergent
gasolines, where available to help minimize
engine deposits and maintain optimal
vehicle and engine performance.
For additional information, visit
www.toptiergas.com.
Note: Use of any fuel for which the vehicle
was not designed can impair the emission
control system, cause loss of vehicle
performance, and cause damage to the
engine which may not be covered by the
vehicle Warranty.
Do not use:
• Diesel fuel.
• Fuels containing kerosene or paraffin.
• Fuel containing more than 15% ethanol
or E85 fuel.
• Fuels containing methanol.
• Fuels containing metallic-based
additives, including manganese-based
compounds.
• Fuels containing the octane booster
additive, methylcyclopentadienyl
manganese tricarbonyl (MMT).
• Leaded fuel, using leaded fuel is
prohibited by law.
2023 Super Duty (TFH) Canada/United States of America, enUSA, Edition date: 202211, DOM
Fuel and Refueling
The use of fuels with metallic compounds
such as methylcyclopentadienyl
manganese tricarbonyl, which is a
manganese-based fuel additive, will impair
engine performance and affect the
emission control system.
SELECTING THE CORRECT FUEL
FOR COLD WEATHER
Choosing the Right Fuel: Vehicles
Operated Where Ultra Low Sulfur
Diesel Fuel Is Required (United
States/Canada/Puerto Rico/U.S.
Virgin Islands And Other Locales)
Note: Your Warranty will not cover damage
caused by using an improper type of fuel or
fuel additive.
Note: Do not blend used engine oil with
diesel fuel under any circumstances.
Blending used oil with the fuel significantly
increases your vehicle s exhaust emissions
and reduce engine life due to increased
internal wear.
We recommend Top Tier diesel fuel where
available to help minimize engine deposits
and maintain optimal vehicle and engine
performance.
For additional information, visit
www.toptiergas.com.
You should use ultra-low sulfur diesel fuel
designated as number 1-D or 2-D with a
maximum of 15-ppm sulfur in your diesel
vehicle. You can operate your vehicle on
diesel fuels containing up to 20%
biodiesel, also known as B20. These fuels
should meet the ASTM D975 diesel or the
ASTM D7467 B6-B20 biodiesel industry
specifications. Outside of North America,
use fuels meeting EN590 or equivalent
local market standard.
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