spark plugs INFINITI QX80 2021 Owner's Manual

105,000 miles/(168,000 km)/
84 months
Standard maintenance:
• Inspect brake lines and cables
• Inspect brake pads and rotors
• Inspect engine drive belts
• Inspect propeller shaft (4WD models)
• Inspect differential gear oil
• Inspect transfer case oil (4WD models)
• Inspect drive shaft boots (4WD models)
• Replace engine coolant (1)
• Replace engine oil and filter
• Replaced in-cabin microfilter
• Replace spark plugs (2)
• Lubricate propeller shaft grease (4WD
models)
• Perform tire rotation
Severe maintenance:
Not Applicable. Proceed to next interval.
(1) First replacement interval is 105,000
miles (168,000 km) or 84 months. After first
replacement, replace every 75,000 miles
(120,000 km) or 60 months.
(2) Replace spark plug when the gap exceeds
0.053 in (1.35 mm) even if within specified
replacement mileage.
120,000 miles/(192,000 km)/
96 months
Standard maintenance:
• Inspect brake lines and cables
• Inspect brake pads and rotors
• Inspect engine drive belts
• Inspect fuel tank vapor vent system hoses
• Inspect fuel lines/connections
• Inspect exhaust system
• Inspect propeller shaft (4WD models)
• Inspect steering gear and linkage
• Inspect axle and suspension parts
• Inspect differential gear oil
• Inspect transfer case oil (4WD models)
• Inspect drive shaft boots (4WD models)
• Replace engine air filter (1)
• Replace brake fluid
• Replace engine oil and filter
• Replaced in-cabin microfilter
• Perform tire rotation
•
Lubricate propeller shaft grease (4WD models)
Severe maintenance:
Not Applicable. Proceed to next interval.
(1) If operating mainly in dusty conditions,
more frequent maintenance may be required.

8 Do-it-yourself
Maintenance precautions ............................................... 8-2
Engine compartment check locations ......................... 8-3VK56VD engine model .............................................. 8-3
Engine cooling system ..................................................... 8-4 Checking engine coolant level ................................. 8-5
Changing engine coolant .......................................... 8-5
Engine oil ........................................................................\
..... 8-6 Checking engine oil level ........................................... 8-6
Changing engine oil and filter .................................. 8-6
Automatic Transmission Fluid (ATF) .......................... 8-8
Power steering fluid ......................................................... 8-8
Brake fluid ........................................................................\
... 8-9 Brake fluid ..................................................................... 8-9
Window washer fluid ................................................... 8-10
Battery ........................................................................\
....... 8-11 Jump starting ............................................................. 8-12
Variable voltage control system ................................. 8-13
Drive belts ........................................................................\
. 8-13
Spark plugs ....................................................................... 8-14 Replacing spark plugs .............................................. 8-14
Air cleaner ........................................................................\
. 8-14 Windshield wiper blades .............................................. 8-15
Cleaning ..................................................................... 8-15
Replacing ................................................................... 8-16
Rear window wiper blades .......................................... 8-16
Brakes ........................................................................\
........ 8-17 Self-adjusting brakes ............................................. 8-17
Brake pad wear warning ....................................... 8-17
Brake booster ........................................................... 8-17
Fuses ........................................................................\
.......... 8-18 Engine compartment .............................................. 8-18
Passenger compartment ...................................... 8-20
Intelligent Key battery replacement ......................... 8-21
Lights ........................................................................\
......... 8-23
Headlights ................................................................ 8-24
Exterior and interior lights ................................... 8-24
Wheels and tires ............................................................. 8-27
Tire pressure ............................................................. 8-27
Tire labeling .............................................................. 8-31
Types of tires ........................................................... 8-33
Tire chains ................................................................ 8-34
Changing wheels and tires ................................... 8-35

8-14Do-it-yourself
WARNING
Be sure the engine and the ignition
switch are off and that the parking
brake is engaged securely.
CAUTION
Be sure to use the correct socket to
remove the spark plugs. An incorrect
socket can damage the spark plugs.
SDI2020
REPLACING SPARK PLUGS
If replacement is required, it is recommended
you visit an INFINITI retailer for this service.
Iridium-tipped spark plugs
It is not necessary to replace the iridium-
tipped spark plugs as frequently as the
conventional type spark plugs since they will
last much longer. Follow the maintenance
schedule shown in the “9. Maintenance and
schedules” section, but do not reuse them by
cleaning or regapping.
Always replace spark plugs with recom-
mended or equivalent ones.
SDI2515
To remove the filter, release the lock pinsand pull the unit upward.
The filter element should not be cleaned and
reused. Replace it according to the main-
tenance intervals. See “9. Maintenance and
schedules” section for maintenance inter-
vals. When replacing the filter, wipe the
inside of the air cleaner housing and the
cover with a damp cloth.
WARNING
. Operating the engine with the air
cleaner removed can cause you or
others to be burned. The air cleaner
SPARK PLUGS AIR CLEANER

The following descriptions are provided to
give you a better understanding of the
scheduled maintenance items that should
be regularly checked or replaced. The main-
tenance schedule indicates at which mile-
age/time intervals each item requires
service.
In addition to scheduled maintenance, your
vehicle requires that some items be checked
during normal day-to-day operation. Refer
to “General maintenance” (P.9-2).
Items marked with “*” are recommended by
INFINITI for reliable vehicle operation. You
are not required to perform maintenance on
these items in order to maintain the warran-
ties which come with your vehicle. Other
maintenance items and intervals are re-
quired.
When applicable, additional information can
be found in the “8. Do-it yourself” section of
this manual.
NOTE:
INFINITI does not advocate the use of non-
OEM approved aftermarket flushing sys-
tems and strongly advises against perform-
ing these services on an INFINITI product.
Many of the aftermarket flushing systems
use non-OEM approved chemicals or sol-
vents, the use of which has not been
validated by INFINITI.
For recommended fuel, lubricants, fluids,grease, and refrigerant, refer to “Capacities
and recommended fluids/lubricants” (P.10-
2) of this manual.
EMISSION CONTROL SYSTEM
MAINTENANCE
Drive belt*:
Check engine drive belt for wear, fraying or
cracking and for proper tension. Replace any
damaged drive belt.
Engine air filter:
Replace at specified intervals. When driving
for prolonged periods in dusty conditions,
check/replace the filter more frequently.
Engine coolant*
Replace coolant at the specified interval.
When adding or replacing coolant, be sure to
use only Genuine NISSAN Long Life Anti-
freeze/Coolant (blue) or equivalent with the
proper mixture. (Refer to “Engine cooling
system” (P.8-4) to determine the proper
mixture for your area.)
NOTE:
Mixing any other type of coolant or the use
of non-distilled water may reduce the
recommended service interval of the cool-
ant.
Engine oil and oil filter:
Replace engine oil and oil filter at the
specified intervals. For recommended oil
grade and viscosity refer to “Capacities and
recommended fluids/lubricants” (P.10-2).
Engine valve clearance*:
Inspect only if valve noise increases. Adjust
valve clearance if necessary.
Evaporative emissions control vapor lines*:
Check vapor lines for leaks or looseness.
Tighten connections or replace parts as
necessary.
Fuel lines*:
Check the fuel hoses, piping and connections
for leaks, looseness, or deterioration. Tight-
en connections or replace parts as necessary.
Spark plugs:
Replace at specified intervals. Install new
plugs of the type as originally equipped.
CHASSIS AND BODY MAINTE-
NANCE
Brake lines and cables:
Visually inspect for proper installation.
Check for chafing, cracks, deterioration,
and signs of leaking. Replace any deterio-
rated or damaged parts immediately.
Maintenance and schedules9-5
EXPLANATION OF SCHEDULED
MAINTENANCE ITEMS

9-18Maintenance and schedules
105,000 Miles/84 Months/
168,000 Km
Standard maintenance:.Inspect brake lines and cables.Inspect brake pads and rotors.Inspect engine drive belts.Inspect propeller shaft (4WD models).Replace differential gear oil.Inspect transfer case oil (4WD models).Inspect drive shaft boots (4WD models).Replace engine coolant (1).Replace engine oil and filter.Replace in-cabin microfilter.Replace spark plugs (2).Lubricate propeller shaft grease (4WD models).Perform tire rotation
Severe maintenance:
Not Applicable. Proceed to next interval.
(1) First replacement interval is 105,000 miles
(168,000 km) or 84 months. After first replace-
ment, replace every 75,000 miles (120,000 km)
or 60 months.
(2) Replace spark plug when the plug gap exceeds
0.053 in (1.35 mm) even if within specified
replacement mileage.
105,000 Miles/126 Months/
168,000 Km
Standard maintenance:
Not Applicable. Proceed to next interval.
Severe maintenance:
.Inspect brake pads and rotors.Inspect steering gear and linkage.Inspect axle and suspension parts.Inspect propeller shaft (4WD models).Inspect drive shaft boots (4WD models).Inspect exhaust system.Replace engine oil and filter
110,000 Miles/132 Months/
176,000 Km
Standard maintenance:
Not Applicable. Proceed to next interval.
Severe maintenance:
.Inspect brake pads and rotors.Inspect steering gear and linkage.Inspect axle and suspension parts.Inspect propeller shaft (4WD models).Inspect drive shaft boots (4WD models).Inspect exhaust system.Replace engine oil and filter.Replace brake fluid

11-6
Rollover .................................................................... 5-8
RoofMoonroof ......................................................... 2-71
Roof rack ......................................................... 2-67
S
SafetyChild seat belts ............................................... 1-29
Towing safety .............................................. 10-23
Seat adjustment Front power seat adjustment ...................... 1-4
Front seats ............................................. 1-4, 1-10
Seat belt(s) Child safety ..................................................... 1-29
Infants ............................................................... 1-30
Injured persons ............................................... 1-21
Larger children ............................................... 1-30
Precautions on seat belt usage ................. 1-18
Pregnant women ........................................... 1-21
Seat belt cleaning ............................................. 7-7
Seat belt extenders ....................................... 1-28
Seat belt maintenance ................................. 1-28
Seat belt warning light and chime ............ 2-14
Seat belts ......................................................... 1-18
Seat belts with pretensioners .................... 1-67
Small children .................................................. 1-30
Three-point type ............................................ 1-21
Seat(s) Climate controlled seats ............................. 2-50
Driver-side memory ..................................... 3-40
Heated seats .................................................. 2-48 Seats .................................................................... 1-3
Security system (INFINITI Vehicle
Immobilizer System), Engine start .................. 2-35
Security system, Vehicle security system ..... 2-34
Servicing climate control ................................... 4-37
Setting memory function, Automatic
drive positioner .................................................... 3-41
Shift lever, Shift lock release ............................ 5-21
Shift lock release Transmission ................................................... 5-21
Shifting, Automatic transmission .................... 5-18
Side ventilators .................................................... 4-27
Smart Rearview Mirror ...................................... 3-31
SNOW mode ....................................................... 5-122
Snow mode switch .............................................. 2-52
Spare tire ................................................... 8-37, 10-9
Spark plugs ............................................................ 8-14
Speedometer ............................................................ 2-7
Standard maintenance .......................................... 9-7
Starting Before starting the engine .......................... 5-15
Jump starting .................................................. 6-11
Precautions when starting and driving ..... 5-4
Push starting ................................................... 6-13
Starting the engine ....................................... 5-15
Status light, Front passenger air bag ............ 1-60
Steering Heated steering wheel ................................. 2-47
Power steering fluid ....................................... 8-8
Power steering system .............................. 5-123
Tilt/telescopic steering ................................ 3-29 Storage ................................................................... 2-60
Sun visors ............................................................... 3-30
Sunglasses holder ................................................ 2-62
Supplemental air bag warning labels ............. 1-68
Supplemental air bag warning light ... 1-69, 2-14
Supplemental restraint system ........................ 1-52
Precautions on supplemental
restraint system ............................................. 1-52
Switch
Autolight switch ............................................ 2-40
Fog light switch ............................................. 2-47
Hazard warning flasher switch .................... 6-2
Headlight aiming control ............................ 2-44
Headlight switch ........................................... 2-40
Ignition switch ................................................ 5-18
Power door lock switch ................................. 3-5
Snow mode switch ........................................ 2-52
Turn signal switch ......................................... 2-46
Vehicle dynamic control (VDC)
off switch ......................................................... 2-53
T
Tachometer ............................................................. 2-8
Temperature gauge, Engine coolant
temperature gauge ............................................... 2-8
Theft (INFINITI Vehicle Immobilizer System),
Engine start ........................................................... 2-35
Three-way catalyst ............................................... 5-4
Tilt/telescopic steering ...................................... 3-29