2020 INFINITI Q50 air filter

4-42Monitor, climate, audio, phone and voice recognition systems
normally.
The sensors
and, located on the
instrument panel, help maintain a constant
temperature. Do not put anything on or
around the sensors.
SERVICING AIR CONDITIONER
WARNING
The air conditioner contains refrigerant
under high pressure. To avoid personal
injury, any air conditioner service should
be done only by an experienced techni-
cian with the proper equipment.
The air conditioner system in your vehicle is
charged with a refrigerant designed with the
environment in mind.
This refrigerant will not harm the earth’s
ozone layer. However, it may contribute in a
small part to global warming.
Special charging equipment and lubricant
are required when servicing your vehicle’s air
conditioner. Using improper refrigerants or
lubricants will cause severe damage to the
air conditioner system. (See “Air conditioning
system refrigerant and lubricant recommen-
dations” (P.10-7).)
An INFINITI retailer will be able to service your environmentally friendly air conditioner
system.
In-cabin microfilter
With Advanced Climate Control system:
The air conditioning system is equipped with
a natural grape seed polyphenol filter which
collects and neutralizes dirt, pollen, dust, etc.
To make sure that the air conditioner heats,
defogs and ventilates efficiently, replace the
filter in accordance with the specified main-
tenance intervals listed in the separate
maintenance booklet. To replace the filter,
contact an INFINITI retailer.
The filter should be replaced if the air flow
decreases significantly or if windows fog up
easily when operating the heater or air
conditioner.
Without Advanced Climate Control system:
The air conditioning system is equipped with
an in-cabin microfilter that collects dirt,
pollen, dust, etc.
To make sure that the air conditioner heats,
defogs and ventilates efficiently, replace the
filter in accordance with the specified main-
tenance schedule in the separate mainte-
nance booklet. To replace the filter, contact
an INFINITI retailer.
The filter should be replaced if the air flow
decreases significantly or if windows fog up
easily when operating the heater or air
conditioner.

8 Do-it-yourself
Maintenance precautions ............................................... 8-2
Engine compartment check locations ......................... 8-3VR30DDTT engine ..................................................... 8-3
Engine cooling system ..................................................... 8-3 Checking engine coolant level ................................ 8-4
Changing engine coolant .......................................... 8-5
Intercooler cooling system ............................................. 8-5 Checking intercooler coolant level ......................... 8-6
Changing intercooler coolant .................................. 8-6
Engine oil ........................................................................\
..... 8-7
Checking engine oil level ........................................... 8-7
Changing engine oil and filter .................................. 8-7
Automatic Transmission Fluid (ATF) .......................... 8-9
Brake fluid ........................................................................\
8-10
Window washer fluid ................................................... 8-10
Battery ........................................................................\
....... 8-11
Checking battery fluid level .................................... 8-12
Jump starting ............................................................. 8-13
Variable voltage control system ................................. 8-13
Drive belts ........................................................................\
. 8-13
Spark plugs ....................................................................... 8-14 Replacing spark plugs .............................................. 8-14 Air cleaner ........................................................................\
8-15
Windshield wiper blades .............................................. 8-15
Cleaning ..................................................................... 8-15
Replacing ................................................................... 8-16
Brakes ........................................................................\
........ 8-16 Self-adjusting brakes ............................................. 8-16
Brake pad wear warning ....................................... 8-16
Fuses ........................................................................\
.......... 8-17 Engine compartment .............................................. 8-17
Passenger compartment ....................................... 8-18
Intelligent Key battery replacement ......................... 8-19
Lights ........................................................................\
......... 8-22 Headlights ................................................................. 8-23
Exterior and interior lights ................................... 8-24
Wheels and tires ............................................................. 8-26 Tire pressure ............................................................. 8-26
Tire labeling ............................................................. 8-30
Types of tires ........................................................... 8-32
Tire chains ................................................................ 8-34
Changing wheels and tires .................................. 8-34
Jacking up the vehicle and replacing tires ...... 8-38

8-2Do-it-yourself
When performing any inspection or main-
tenance work on your vehicle, always take
care to prevent serious accidental injury to
yourself or damage to the vehicle. The
following are general precautions which
should be closely observed.
WARNING
.Park the vehicle on a level surface,
apply the parking brake securely and
block the wheels to prevent the
vehicle from moving. Move the shift
lever to P (Park).
. Be sure the ignition switch is in the
OFF or LOCK position when per-
forming any parts replacement or
repairs.
. Never connect or disconnect the
battery or any transistorized compo-
nent while the ignition switch is in the
ON position.
. Never leave the engine or automatic
transmission related component har-
nesses disconnected while the igni-
tion switch is in the ON position.
. If you must work with the engine
running, keep your hands, clothing,
hair and tools away from moving
fans, belts and any other moving parts.
. It is advisable to secure or remove
any loose clothing and remove any
jewelry, such as rings, watches, etc.
before working on your vehicle.
. Always wear eye protection when-
ever you work on your vehicle.
. If you must run the engine in an
enclosed space such as a garage, be
sure there is proper ventilation for
exhaust gases to escape.
. Never get under the vehicle while it is
supported only by a jack. If it is
necessary to work under the vehicle,
support it with safety stands.
. Keep smoking materials, flame and
sparks away from fuel tank and the
battery.
. Your vehicle is equipped with an
automatic engine cooling fan. It may
come on at any time without warn-
ing, even if the ignition key is in the
OFF position and the engine is not
running. To avoid injury, always dis-
connect the negative battery cable
before working near the fan.
. Because the fuel lines are under high
pressure even when the engine is off,
it is recommended you visit an
INFINITI retailer for service of the fuel filter or fuel lines.
CAUTION
.
Do not work under the hood while the
engine is hot. Turn the engine off and
wait until it cools down.
. Avoid direct contact with used en-
gine oil and coolant. Improperly dis-
posed engine oil, coolant, and/or
other vehicle fluids can damage the
environment. Always conform to lo-
cal regulations for disposal of vehicle
fluid.
This “8. Do-it-yourself” section gives in-
structions regarding only those items which
are relatively easy for an owner to perform.
A genuine INFINITI Service Manual is also
available. (See “Owner’s Manual/Service
Manual order information” (P.10-23).)
You should be aware that incomplete or
improper servicing may result in operating
difficulties or excessive emissions, and could
affect your warranty coverage. If in doubt
about any servicing, it is recommended you
have it done by an INFINITI retailer.
MAINTENANCE PRECAUTIONS

WARNING
.Operating the engine with the air
cleaner removed can cause you or
others to be burned. The air cleaner
not only cleans the air, it stops flame
if the engine backfires. If it isn’t
there, and the engine backfires, you
could be burned. Do not drive with
the air cleaner removed, and be care-
ful when working on the engine with
the air cleaner removed.
. Never pour fuel into the throttle body
or attempt to start the engine with
the air cleaner removed. Doing so
could result in serious injury.
The filter element should not be cleaned and
reused. Replace it according to the main-
tenance schedule shown in the “9. Main-
tenance and schedules” section. When
replacing the filter, wipe the inside of the
air cleaner housing and the cover with a
damp cloth.
When maintenance is required, it is recom-
mended you contact an INFINITI retailer for
servicing.
CLEANING
If your windshield is not clear after using the
windshield washer or if a wiper blade
chatters when running, wax or other materi-
al may be on the blade or windshield.
Clean the outside of the windshield with a
washer solution or a mild detergent. Your
windshield is clean if beads do not form
when rinsing with clear water.
Clean each blade by wiping it with a cloth
soaked in a washer solution or a mild
detergent. Then rinse the blade with clear
water. If your windshield is still not clear
after cleaning the blades and using the
wiper, replace the blades.
Worn windshield wiper blades can damage
the windshield and impair driver vision.
When a washer nozzle is clogged
It is recommended you see an INFINITI
retailer if a washer nozzle is clogged or any
malfunction occurs. Do not attempt to clean
the nozzle using a needle or a pin. Doing so
may damage the nozzle.
Do-it-yourself8-15
AIR CLEANER WINDSHIELD WIPER BLADES

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 belts*:
Check engine drive belts for wear, fraying or
cracking and for proper tension. Replace any
damaged drive belts.
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.8-3) 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.
Intercooler coolant:
Intercooler coolant is maintenance-free.
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

9-8Maintenance and schedules
STANDARD MAINTENANCEAbbreviations: I = Inspect and correct or replace as necessary, R = Replace
MAINTENANCE OPERA-
TION
Perform at number of miles,
kilometers or months, which-
ever comes first. Miles ×
1,000 (km ×
1,000)
Months MAINTENANCE INTERVAL
5
(8) 6 10
(16) 12 15
(24) 18 20
(32) 24 25
(40) 30 30
(48) 36 35
(56) 42 40
(64) 48 45
(72) 54 50
(80) 60 55
(88) 66 60
(96) 72 65
(104) 78 70
(112) 84 75
(120) 90 80
(128) 96 85
(136) 102 90
(144) 108 95
(152) 114 100
(160) 120 105
(168) 126 110
(176) 132 115
(184) 138 120
(192) 144
Air cleaner filter NOTE (1) RR R R
Automatic transmission fluid NOTE (2)
Brake fluid$ RR R R R R
Brake lines and cables IIII I I I II II I
Brake pads and rotors$ IIIIIIIIIIII
Drive belts NOTE (3) I* I* I*I*I* I*I*I* I*
Engine coolant* NOTE (4)
(5)
Engine oil & oil filter NOTE (6) R R R R R R RR R RR R
EVAP vapor lines & Fuel lines I*I* I* I* I* I*
Exhaust system$ II I I I I
Fuel filter NOTE (2)
In-cabin microfilter RRR R R R R R
Intake & exhaust valve clear-
ance NOTE
(7)
Intelligent Key battery IR R R R R R R
Propeller shaft & drive shaft
boots (AWD models)$ IIIIIIIIIIII
Spark plugs NOTE (8) Replace every 105,000 miles (168,000 km)
Steering gear and linkage, axle
and suspension parts$ II I I I I
Stop lamp switch and brake
pedal position switch NOTE (9) I
III I I I II II I
Tire rotation NOTE
(10)
Transfer fluid & differential
gear oil NOTE
(11) IIIIIIIIIIII

10 Technical and consumer information
Capacities and recommended fluids/lubricants ..... 10-2Fuel information ....................................................... 10-4
Engine oil and oil filter recommendation ........... 10-6
Air conditioning system refrigerant and
lubricant recommendations .................................... 10-7
Specifications .................................................................. 10-8
Engine ........................................................................\
.. 10-8
Wheels and tires ........................................................ 10-9
Dimensions ............................................................... 10-10
When traveling or registering in
another country ............................................................. 10-11
Vehicle identification ................................................... 10-11 Vehicle Identification Number (VIN) plate ....... 10-11
Vehicle identification number
(chassis number) ...................................................... 10-11
Engine serial number ............................................. 10-12
F.M.V.S.S./C.M.V.S.S. certification label ........ 10-12
Emission control information label ................... 10-12
Tire and loading information label .................... 10-13
Air conditioner specification label ..................... 10-13 Installing front license plate ..................................... 10-14
Removing air deflectors ............................................ 10-15
Vehicle loading information ..................................... 10-16
Terms ....................................................................... 10-16
Vehicle load capacity ........................................... 10-17
Loading tips ........................................................... 10-18
Measurement of weights ................................... 10-18
Towing a trailer ........................................................... 10-19 Flat towing ............................................................. 10-19
Uniform tire quality grading .................................... 10-19
Treadwear .............................................................. 10-19
Traction AA, A, B and C ..................................... 10-20
Temperature A, B and C .................................... 10-20
Emission control system warranty ......................... 10-20
Reporting safety defects .......................................... 10-21
Readiness for Inspection/Maintenance (I/M)
test (US only) ................................................................ 10-22
Event Data Recorders (EDR) ................................... 10-23
Owner’s Manual/Service Manual
order information ........................................................ 10-23

Oil viscosity
The engine oil viscosity or thickness changes
with temperature. Because of this, it is
important that the engine oil viscosity be
selected based on the temperatures at which
the vehicle will be operated before the next
oil change. Choosing an oil viscosity other
than that recommended could cause serious
engine damage.
Selecting the correct oil filter
Your new vehicle is equipped with a high-
quality genuine NISSAN oil filter. When
replacing, use the genuine oil filter or its
equivalent for the reason described in
change intervals.
Change intervals
The oil and oil filter change intervals for your
engine are based on the use of the specified
quality oils and filters. Oil and filter other
than the specified quality, or oil and filter
change intervals longer than recommended
could reduce engine life. Damage to engines
caused by improper maintenance or use of
incorrect oil and filter quality and/or vis-
cosity is not covered by the new INFINITI
vehicle limited warranties.
Your engine was filled with a high quality
engine oil when it was built. You do not have
to change the oil before the first recom-mended change interval. Oil and filter
change intervals depend upon how you use
your vehicle. Operation under the following
conditions may require more frequent oil and
filter changes.
AIR CONDITIONING SYSTEM RE-
FRIGERANT AND LUBRICANT
RECOMMENDATIONS
The air conditioning system in your INFINITI
vehicle must be charged with the refriger-
ant HFC-134a (R-134a) and the lubricant,
NISSAN A/C system oil PAG or the exact
equivalents.
CAUTION
The use of any other refrigerant or
lubricant may cause severe damage to
the air conditioning system and may
require the replacement of all air condi-
tioner system components.
The refrigerant HFC-134a (R-134a) in your
INFINITI vehicle will not harm the earth’s
ozone layer. Although this refrigerant does
not affect the earth’s atmosphere, certain
governmental regulations require the recov-
ery and recycling of any refrigerant during
automotive air conditioning system service. Your INFINITI retailer has the trained tech-
nicians and equipment needed to recover
and recycle your air conditioning system
refrigerant.
It is recommended you visit an INFINITI
retailer when servicing your air conditioning
system.
Technical and consumer information10-7