2021 LINCOLN NAUTILUS engine

FUEL QUALITY
Selecting the Correct Fuel
Your vehicle operates on regular unleaded
gasoline with a minimum pump (R+M)/2
octane rating of 87.
Some fuel stations, particularly those in high
altitude areas, offer fuels posted as regular
unleaded gasoline with an octane rating
below 87. The use of these fuels could result
in engine damage that will not be covered
by the vehicle Warranty. 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 299).
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.
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.
LOCATING THE FUEL FILLER
FUNNEL
Easy Fuel Capless Filler 198
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Fuel and RefuelingE161513

2. Fully insert the fuel filler funnel into the
fuel filler inlet.
3. Add fuel to your vehicle from the fuel container.
4. Remove the fuel filler funnel.
5. Fully close the fuel filler door.
6. Clean the fuel filler funnel and place it back in your vehicle or correctly dispose
of it.
Note: If your vehicle runs out of fuel add a
minimum of 1.3 gal (5 L) of fuel to restart the
engine.
Note: You may need to switch the ignition
from off to on several times after refueling
to allow the fuel system to pump the fuel
from the tank to the engine. When restarting,
cranking time takes a few seconds longer
than normal.
Note: Extra funnels can be purchased from
an authorized dealer if you choose to
dispose of the funnel. REFUELING
Refueling System Overview
Fuel filler door.
A
Fuel tank filler valve.
B
Fuel tank filler pipe.
C Refueling Your Vehicle WARNING: When refueling always
shut the engine off and never allow sparks
or open flames near the fuel tank filler
valve. Never smoke or use a cell phone
while refueling. Fuel vapor is extremely
hazardous under certain conditions. Avoid
inhaling excess fumes. WARNING:
The fuel system may be
under pressure. If you hear a hissing sound
near the fuel filler inlet, do not refuel until
the sound stops. Otherwise, fuel may spray
out, which could cause serious personal
injury. WARNING:
Do not pry open the fuel
tank filler valve. This could damage the fuel
system. Failure to follow this instruction
could result in fire, personal injury or death. WARNING:
Do not remove the fuel
pump nozzle from its fully inserted position
when refueling.
200
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Fuel and RefuelingB
C
A E267248

5.
Operate the fuel pump nozzle within the
area shown. Refer to A for left hand drive
or B for right hand drive. 6. When the pump shuts off, wait five
seconds, then raise the fuel pump nozzle
and slowly remove it.
7. Fully close the fuel filler door.
Note: Do not attempt to start the engine if
you have filled the fuel tank with incorrect
fuel. Incorrect fuel use could cause damage
not covered by the vehicle Warranty. Have
your vehicle immediately checked.
Manually Opening the Fuel Filler Door
Your vehicle does not have a fuel tank filler
cap. Left-hand side. To open the fuel
filler door, press the center rear
edge of the fuel filler door and
then release.
A
Right-hand side. To open the fuel
filler door, press the center rear
edge of the fuel filler door and
then release.
B Left-hand side. Pull the rear of the
fuel filler door to open it.
C
Right-hand side. Pull the rear of the
fuel filler door to open it.
D
FUEL TANK CAPACITY
Advertised Capacity
The advertised capacity is the maximum
amount of fuel that you can add to the fuel
tank after running out of fuel. Included in the
advertised capacity is an empty reserve. The
empty reserve is an unspecified amount of
fuel that remains in the fuel tank when the
fuel gauge indicates empty.
Note: The amount of fuel in the empty
reserve varies and should not be relied upon
to increase driving range.
202
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Fuel and RefuelingE119081 E206911

FUEL AND REFUELING –
TROUBLESHOOTING
Fuel and Refueling – Warning Lamps
If it illuminates when you are
driving, refuel as soon as possible.
Fuel and Refueling – Information
Messages
Refueling System Warning
If the fuel tank filler valve does not fully close,
a message could appear in the information
display. Message
Check Fuel Fill Inlet
If the message appears, do the following:
1. Stop your vehicle as soon as it is safe to
do so and switch the engine off.
2. Shift into park (P) or neutral (N). 3. Apply the parking brake.
4. Fully open the fuel filler door.
5. Check the fuel tank filler valve for any
debris that may be restricting its
movement.
6. Remove any debris from the fuel tank filler valve.
7. Fully insert a fuel pump nozzle or the fuel
filler funnel provided with your vehicle
into the fuel filler pipe. See Locating the
Fuel Filler Funnel (page 198). This action
should dislodge any debris that may be
preventing the fuel tank filler valve from
fully closing.
8. Remove the fuel pump nozzle or fuel filler
funnel from the fuel filler pipe.
9. Fully close the fuel filler door.
Note: The message may not immediately
reset. If the message continues to appear
and a warning lamp illuminates, have your
vehicle checked as soon as possible.
203
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Fuel and Refueling

WHAT IS THE CATALYTIC
CONVERTER
The catalytic converter is part of your
vehicle's emissions system and filters harmful
pollutants from the exhaust gas.
CATALYTIC CONVERTER
PRECAUTIONS
WARNING: Do not park, idle or drive
your vehicle on dry grass or other dry
ground cover. The emission system heats
up the engine compartment and exhaust
system, creating the risk of fire. WARNING:
The normal operating
temperature of the exhaust system is very
high. Never work around or attempt to
repair any part of the exhaust system until
it has cooled. Use special care when
working around the catalytic converter.
The catalytic converter heats up to a very
high temperature after only a short period
of engine operation and stays hot after the
engine is switched off.
To avoid damaging the catalytic converter:
• Do not crank the engine for more than
10 seconds at a time.
• Do not run the engine with a spark plug
lead disconnected.
• Do not push-start or tow-start your
vehicle. Use booster cables.
See Jump
Starting Precautions (page 309).
• Use the correct fuel.
See Fuel and
Refueling (page 197).
• Do not switch the ignition off when your
vehicle is moving. •
Avoid running out of fuel.
• Have the items listed in scheduled
maintenance information performed
according to the specified schedule.
Note: Do not make any unauthorized
changes to your vehicle or engine. By law,
vehicle owners and anyone who
manufactures, repairs, or services a fleet of
vehicles are not permitted to intentionally
remove an emission control device or
prevent it from working.
CATALYTIC CONVERTER –
TROUBLESHOOTING
Catalytic Converter – Warning Lamps
Your vehicle has an on-board diagnostics
system that monitors the emission control
system. If any of the following warning lamps
illuminate, this may indicate that the on-board
diagnostics system has detected an emission
control system malfunction.
204
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Catalytic Converter

Continuing to drive your vehicle may cause
reduced power or the engine to stop. Failure
to respond to a warning lamp may cause
damage that your vehicle Warranty may not
cover. Have your vehicle checked as soon
as possible.
205
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Catalytic Converter

AUTOMATIC TRANSMISSION
PRECAUTIONS
WARNING: Always fully apply the
parking brake and make sure you shift into
park (P). Failure to follow this instruction
could result in personal injury or death. WARNING:
Do not apply the brake
pedal and accelerator pedal
simultaneously. Applying both pedals
simultaneously for more than a few
seconds will limit engine performance,
which may result in difficulty maintaining
speed in traffic and could lead to serious
injury. WARNING:
When your vehicle is
stationary, keep the brake pedal fully
pressed when shifting gears. Failure to
follow this instruction could result in
personal injury, death or property damage. Note:
Do not use supplemental transmission
fluid additives, treatments, or cleaning
agents. Failure to follow this instruction could
result in vehicle damage not covered by the
vehicle warranty.
AUTOMATIC TRANSMISSION
POSITIONS
Park (P) WARNING:
Move the transmission
selector lever to park (P) only when your
vehicle is stationary.
This position locks the driveline. Come to a
complete stop before putting your vehicle
into and out of park (P).
The electric parking brake could apply when
you shift to park (P) without the brake pedal
fully pressed. The electric parking brake
applies when you shift to park (P) on large
slopes. The electric parking brake releases
with the drive away release function.
See
Electric Parking Brake (page 221). Note:
A warning tone sounds if you open the
driver door and you have not shifted the
transmission selector to park (P).
Reverse (R) WARNING:
Move the transmission
selector lever to reverse (R) only when your
vehicle is stationary and the engine is at
idle speed.
This position allows your vehicle to move
backward. Come to a complete stop before
shifting into and out of reverse (R).
Neutral (N) WARNING: In neutral (N) your vehicle
has the ability to roll freely. If you intend to
leave your vehicle, make sure you apply
the parking brake.
This position allows your vehicle to roll free.
Hold the brake pedal down when in this
position.
206
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Automatic Transmission

Note:
You can start your vehicle in this
position.
Drive (D)
Drive (D) is the normal driving position, and
allows automatic upshifts and downshifts
through all available gears.
Sport (S)
Putting the vehicle in sport (S):
• Provides additional engine braking and
extends lower gear operation to enhance
performance for uphill climbs, hilly terrain
or mountainous areas. This increases
engine RPM during engine braking.
• Provides additional lower gear operation
through the automatic transmission shift
strategy.
• Provides gear selection more quickly and
at higher engine speeds.
Note: You can shift into sport at any vehicle
speed. SHIFTING YOUR VEHICLE INTO
GEAR
The gear selector is located near the middle
of the instrument panel. Press a button to
select a gear.
•
Park (P)
• Reverse (R)
• Neutral (N)
• Drive (D)
• Sport (S) (If equipped)
Note: The gear selector prevents shifting out
of park (P) when the intelligent access key
is outside the vehicle. Note:
The gear selector will automatically
return to park (P) when you take actions
associated with leaving the vehicle. See
How Does Automatic Return to Park (P)
Work
(page 209).
AUTOMATIC TRANSMISSION
POSITION INDICATORS
The instrument cluster displays the current
position. Note:
The position could illuminate on the
transmission selector.
MANUALLY SHIFTING GEARS (If
Equipped)
Shifting Using the Paddle Shifters
Use this procedure to shift your transmission
manually.
207
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing Automatic TransmissionE334149 E317779