2023 HYUNDAI SONATA checking oil

02
2-15
Recommended SAE Viscosity Number
CAUTION
Always be sure to clean the area around
any filler plug, drain plug, or dipstick
before checking or draining any
lubricant. This is especially important
in dusty or sandy areas and when the
vehicle is used on unpaved roads.
Cleaning the plug and dipstick areas
will prevent dirt and grit from entering
the engine and other mechanisms that
could be damaged. Engine oil viscosity (thickness) has an
effect on fuel economy and cold weather
operating (engine start and engine oil
flowability). Lower viscosity engine oils
can provide better fuel economy and
cold weather performance, however,
higher viscosity engine oils are required
for satisfactory lubrication in hot
weather.
Using oils of any viscosity other than
those recommended could result in engine damage. When choosing an oil, consider the
range of temperature your vehicle will be
operated in before the next oil change.
Proceed to select the recommended oil
viscosity from the chart.
Temperature Range for SAE Viscosity Numbers
Temperature °C
-30-20 -10 0 10 20 30 40 50
(°F) -100 20 40 60 80 100 120
Engine Oil * 1Smartstream
G1.6 T-GDI
Smartstream G2.5 GDI
Smartstream G2.5 T-GDI
0W-30
0W-20
* 1
: Requires grade engine oil.
An engine oil displaying this American Petroleum Institute(API) Certification
Mark conforms to the International Lubricant Specification Advisory Committee
(ILSAC). It is recommended to only use engine oils that uphold this API
Certification Mark.

Convenience Features
5-124
Checking the amount of air
conditioner refrigerant and
compressor lubricant
When the amount of refrigerant is low,
the performance of the air conditioning
is reduced. Overfilling also reduces the
performance of the air conditioning
system.
Therefore, if abnormal operation is
found, have the system inspected by an
authorized HYUNDAI dealer.
NOTICE
It is important that the correct type and
amount of oil and refrigerant is used.
Otherwise, damage to the compressor
and abnormal system operation may
occur. To prevent damage, the air
conditioning system in your vehicle
should only be serviced by trained and
certified technicians.
WARNING
Vehicles equipped with R-1234yf
Since the refrigerant is mildly flammable and
operated at high pressure,
the air conditioning system
should only be serviced
by trained and certified
technicians. It is important
that the correct type
and amount of oil and
refrigerant are used.
All refrigerants should be reclaimed
with proper equipment.
Venting refrigerants directly to the
atmosphere is harmful to individuals
and environment. Failure to heed these
warnings can lead to serious injuries.

Engine Compartment .................................................................................... 8-3
Maintenance Services ................................................................................... 8-5
Owner’s Responsibility ............................................................................................ 8-5
Owner Maintenance Precautions ............................................................................ 8-5
Owner Maintenance ...................................................................................... 8-6
Owner Maintenance Schedule ................................................................................ 8-6
Scheduled Maintenance Services ................................................................ 8-8
Maintenance Schedule (Smartstream G1.6 T-GDI) ................................................8-8
Maintenance Schedule (Smartstream G2.5 GDI) ..................................................8-12
Maintenance Schedule (Smartstream G2.5 T-GDI) ...............................................8-16
Explanation of Scheduled Maintenance Items ..........................................8-20
Engine Oil ..................................................................................................... 8-23
Checking the Engine Oil Level ............................................................................... 8-23
Checking the Engine Oil and Filter ....................................................................... 8-25
Engine Coolant ............................................................................................. 8-26
Checking the Engine Coolant Level ...................................................................... 8-26
Changing Engine Coolant ...................................................................................... 8-28
Brake Fluid .................................................................................................... 8-29
Checking the Brake Fluid Level ............................................................................. 8-29
Washer Fluid ................................................................................................. 8-30
Checking the Washer Fluid Level .......................................................................... 8-30
Air Cleaner ..................................................................................................... 8-31
Filter Replacement .................................................................................................. 8-31
Climate Control Air Filter ............................................................................. 8-33
Filter Inspection...................................................................................................... 8-33
Filter Replacement ................................................................................................. 8-33
Wiper Blades ................................................................................................ 8-34
Blade Inspection .................................................................................................... 8-34
Blade Replacement ................................................................................................ 8-34
Battery .......................................................................................................... 8-36
For Best Battery Service ........................................................................................ 8-36
Battery Recharging ................................................................................................ 8-37
Reset Features ........................................................................................................ 8-37
8. Maintenance
8

08
8-23
Checking the Engine Oil Level
Engine oil is used for lubricating,
cooling, and operating various hydraulic
components in the engine. Engine oil
consumption while driving is normal,
and it is necessary to check and refill the
engine oil regularly. Also, check and refill
the oil level within the recommended
maintenance schedule to prevent
deterioration of oil performance.
Check the engine oil following the below
procedure.
1. Follow all of the oil manufacturer’sprecautions.
2. Be sure the vehicle is on the level
ground in P (Park) with the parking
brake set. If possible, block thewheels.
3. Turn the engine on and allow the engine to reach normal operating
temperature.
4. Turn the engine off and wait about
fifteen minutes for the oil to return tothe oil pan.
5. Pull the dipstick out, wipe it clean, and re-insert it fully.
ODN8089104
„
„Smartstream G1.6 T-GDi
ODN8A080107
„
„Smartstream G2.5 GDi ,Smartstream G2.5 T-GDi
6. Pull the dipstick out again and check the level. The level should be between
F (Full) and L (Low).
EnginE oiL

08
8-25
Checking the Engine Oil and
Filter
• Have engine oil and filter changed
by an authorized HYUNDAI dealer
according to the Maintenance
Schedule at the beginning of this
chapter.
• If the maintenance schedule to
replace engine oil is exceeded,
the engine oil performance may
deteriorate, and the engine condition
may be affected. Therefore, replace
the engine oil according to the
maintenance schedule.
• To keep the engine in optimal
condition, use the recommended
engine oil and filter. If the
recommended engine oil and filter are
not used, replace it according to the
maintenance schedule under severe usage conditions.
• The purpose of the maintenance
schedule for engine oil replacement
is to prevent oil deterioration and it is
irrelevant to oil consumption. Check
and refill engine oil regularly.
WARNING
Used engine oil may cause irritation or
cancer of the skin if left in contact with
the skin for prolonged periods of time.
Always protect your skin by washing
your hands thoroughly with soap and
warm water as soon as possible after handling used oil.
Information
When the oil pressure is low due to insufficient engine oil, the Engine
Oil Pressure (
) warning light will
illuminate. In addition, the enhanced
engine protection system, which limits
the engine’s power is activated and the
Malfunction Indicator Lamp (
) will
illuminate when the vehicle is driven in
this state continuously. When oil pressure
is restored, the Engine Oil Pressure warning light will turn off and the engine
power will no longer be limited.
However, for gasoline 2.5 turbo engine,
when the oil pressure is restored, the warning light and the enhanced engine
protection system will turn off after the
engine is restarted.
CAUTION
The engine oil is very hot immediately
after the vehicle has been driven and
can cause burns during replacement.
Replace the engine oil after the engine
oil has cooled down.

08
8-29
Checking the Brake Fluid Level
ODN8089005
Check the fluid level in the reservoir
periodically. The fluid level should be
between MAX and MIN marks on the side
of the reservoir.
Before removing the reservoir cap and
adding brake fluid, clean the area around
the reservoir cap thoroughly to prevent
brake fluid contamination.
If the level is low, add the specified brake
fluid to the MAX level. The level will fall
with accumulated mileage. This is a
normal condition associated with the
wear of the brake linings. If the fluid level
is excessively low, have the brake system
checked by an authorized HYUNDAI
dealer.
WARNING
If the brake system requires frequent
additions of fluid this could indicate
a leak in the brake system. Have the
vehicle inspected by an authorized
HYUNDAI dealer.
WARNING
Do not allow brake fluid to come in
contact with your eyes. If brake fluid
comes in contact with your eyes, flush
your eyes with clean water for at least
15 minutes and get immediate medical
attention.
NOTICE
• Do not allow brake fluid to contact
the vehicle’s body paint, as paint
damage will result.
• Brake fluid, which has been exposed
to open air for an extended time should NEVER be used as its quality
cannot be guaranteed. It should be
disposed of properly.
• Do not use the wrong kind of brake
fluid. A few drops of mineral based
oil, such as engine oil, in your brake
system can damage brake system parts.
Information
Use only the specified brake fluid (refer to “Recommended Lubricants and
Capacities” in chapter 2).
BraKE fLUiD

08
8-37
Battery Recharging
WARNING
Always follow these instructions when
recharging your vehicle’s battery to
avoid the risk of SERIOUS INJURY or
DEATH from explosions or acid burns: • Before performing maintenance or
recharging the battery, turn off all
accessories and place the ignition
switch to the LOCK/OFF position.
• Keep all flames, sparks, or smoking
materials away from the battery.
• Always work outdoors or in an area
with plenty of ventilation.
• Wear eye protection when checking
the battery during charging.
• The battery must be removed from
the vehicle and placed in a well
ventilated area.
• Watch the battery during charging,
and stop or reduce the charging
rate if the battery cells begin boiling
violently.
• Vehicle is equipped with the
Absorbent Glass Mat (AGM) battery.
Do not charge the AGM battery with
a general charger. It may damage
or explode the AGM battery. Only
charge the AGM battery with a
charger that has AGM battery
setting.
• The negative battery cable must
be removed first to disconnect
the battery and installed last
to reconnect with the battery.
Disconnect the battery charger in the
following order:
1. Turn off the battery charger main
switch.
2. Unhook the negative clamp from the negative battery terminal.
3. Unhook the positive clamp from the positive battery terminal.
• Always use a genuine HYUNDAI
approved battery when you replace
the battery. By jump starting
After a jump start, idle the engine
with the headlights ON for 20-30
minutes before shutting the engine
off. The vehicle may not restart if you
shut it off before the battery had a
chance to adequately recharge. See
“Jump Starting” in chapter 7 for more
information on jump starting procedures.
Information
An inappropriately disposed battery can be harmful to
the environment and human health. Dispose of the battery
according to your local law(s) or
regulations.
Reset Features
The following items may need to be reset
after the battery has been discharged or
the battery has been disconnected. See
chapter 3 or 4 for: •
Power Windows
• Trip Computer
• Climate Control System
• Clock
• Audio System
• Sunroof

I
I-5
E Emission Control System .................................................................................... 8-70
Engine Compartment ..................................................................................... 2-8/ 8-3
Engine Coolant .................................................................................................... 8-26
Changing Engine Coolant ................................................................................ 8-28
Checking the Engine Coolant Level ................................................................. 8-26
Engine Number .................................................................................................... 2-17
Engine Oil ............................................................................................................ 8-23
Checking the Engine Oil and Filter .................................................................. 8-25
Checking the Engine Oil Level ........................................................................ 8-23
Engine Specification ............................................................................................ 2-10
Explanation of Scheduled Maintenance Items ....................................................8-20
Exterior Features .................................................................................................. 5-50
Emergency Trunk Safety Release..................................................................... 5-52
Fuel Filler Door ................................................................................................ 5-56
Hood ................................................................................................................. 5-50
Trunk ................................................................................................................ 5-51
Exterior Overview ................................................................................................. 2-2
F
Forward Collision – Avoidance Assist (FCA) - Sensor Fusion ...........................6-50
FCA Sensor ...................................................................................................... 6-55
FCA Warning Message And Brake Control .....................................................6-52
Forward Collision-Avoidance Assist - Junction Turning ................................6-65
Limitations of The System ............................................................................... 6-58
System Malfunction ......................................................................................... 6-57
System Setting and Activation ......................................................................... 6-50
Forward/Reverse Parking Distance Warning (PDW) ..........................................5-86
Forward/Reverse Parking Distance Warning System Precautions ...................5-90
Non-Operational Conditions of Forward/Reverse Parking Distance
Warning System ............................................................................................. 5-89
Operation of Forward/Reverse Parking Distance Warning System .................5-87
Fuel Requirements ................................................................................................. 1-5
Fuses .................................................................................................................... 8-50
Engine Compartment Panel Fuse Replacement ...............................................8-52
Fuse/Relay Panel Description .......................................................................... 8-53
Instrument Panel Fuse Replacement ................................................................ 8-51