Normal Maintenance Schedule HYUNDAI SONATA 2021 Owners Manual

01
1 -7
Detergent Fuel Additives
HYUNDAI recommends that you use
good quality gasolines treated with
detergent additives such as TOP TIER
Detergent Gasoline, which help prevent
deposit formation in the engine. These
gasolines will help the engine run
cleaner and enhance performance of
the Emission Control System. For more
information on TOP TIER Detergent
Gasoline, please go to the website (www.
toptiergas.com).
For customers who do not use TOP Tier
Detergent Gasoline regularly, and have
problems starting or the engine does
not run smoothly, detergent-based
fuel additives that you can purchase
separately may be added to the gasoline.
If TOP TIER Detergent Gasoline is
not available, one bottle of additive
added to the fuel tank according to the
maintenance schedule is recommended
(refer to the Maintenance Schedule in
chapter 8).
Additives are available from your
authorized HYUNDAI dealer along with
information on how to use them. Do not
mix other additives.
Operation in foreign countries
If you are going to drive your vehicle in
another country, be sure to:
• Observe all regulations regarding
registration and insurance.
• Determine that acceptable fuel is
available. •
This vehicle should not be modified.
Modification of your vehicle could
affect its performance, safety or
durability and may even violate
governmental safety and emissions
regulations.
In addition, damage or performance
problems resulting from any
modification may not be covered
under warranty.
• If you use unauthorized electronic
devices, it may cause the vehicle to
operate abnormally, wire damage,
battery discharge and fire. For your
safety, do not use unauthorized
electronic devices.
Vehicle Break-in
Pr ocess
By following a few simple precautions for
the first 600 miles (1,000 km) you may
add to the performance, economy and
life of your vehicle.
• Do not race the engine.
• While driving, keep your engine speed
(rpm, or revolutions per minute)
between 2,000 rpm and 4,000 rpm.
• Do not maintain a single speed for
long periods of time, either fast or
slow. Varying engine speed is needed
to properly break-in the engine.
• Avoid hard stops, except in
emergencies, to allow the brakes to
seat properly.
VeHIcle ModIfIcatIons

05
5-125
Air conditioning system operation tips
• If the vehicle has been parked in
direct sunlight during hot weather,
open the windows for a short time
to let the hot air inside the vehicle
escape.
• After sufficient cooling has been
achieved, switch back from the
recirculated air to the fresh outside air
position.
• To help reduce moisture inside of
the windows on rainy or humid
days, decrease the humidity inside
the vehicle by operating the air
conditioning system with the windows
and sunroof closed.
• Use the air conditioning system
every month only for a few minutes
to ensure maximum system
performance.
• If you operate air conditioner
excessively, the difference between
the temperature of the outside air and
that of the windshield could cause
the outer surface of the windshield
to fog up, causing loss of visibility. In
this case, set the mode selection knob
or button to the
position and fan
speed control to the lower speed.
System Maintenance
Cabin air filter
OIK047401L[A] : Outside air, [B] : Recirculated air
[C] : Cabin air filter, [D] : Blower
[E] : Evaporator core, [F] : Heater core
The cabin air filter is installed behind
the glove box. It filters the dust or other
pollutants that enter the vehicle through
the heating and air conditioning system.
Have the cabin air filter replaced by an
authorized HYUNDAI dealer according to
the maintenance schedule. If the vehicle
is being driven in severe conditions such
as dusty or rough roads, more frequent
cabin air filter inspections and changes
are required.
If the air flow rate suddenly decreases,
the system should be checked at an
authorized HYUNDAI dealer.
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.

Engine Compartment ........................................................................\
............8 -3
Maintenance Services ........................................................................\
........... 8-4
Owner’s Responsibility ........................................................................\
.................... 8-4
Owner Main tenance Precautions ........................................................................\
.... 8-4
Owner Maintenance ........................................................................\
.............. 8-5Owner Maintenance Schedule ........................................................................\
........8-5
Scheduled Maintenance Services ................................................................8 -7Normal Maintenance Schedule (Smartstream G1.6 T-GDi) ...................................8-8
Main tenance Under Severe Usage Conditions (Smartstream G1.6 T-GDi) .........8-11
Severe Driving Conditions
........................................................................\
.............. 8-11
Normal Maintenance Schedule (Smartstream G2.5 GDi)
.....................................8-12
Maintenance Under Severe Usage Conditions (Smartstream G2.5 GDi)


................8-15
Severe Driving Conditions
........................................................................\
.............. 8-15
Explanation of Scheduled Maintenance Items ..........................................8- 16
Engine Oil ........................................................................\
............................. 8-19
Checking the Engine Oil Level ........................................................................\
........8- 19
Checking the Engine Oil and Filter ....................................................................... 8-20
Checking the Engine Coolant Level

....................................................................... 8-

21
Engine Coolant ........................................................................\
......................8- 21Changing Engine Coolant ........................................................................\
..............8- 23
Brake Fluid ........................................................................\
............................8 -24Checking the Brake Fluid Level ........................................................................\
.....8 -24
Washer Fluid ........................................................................\
.........................8- 25Checking the Washer Fluid Level ........................................................................\
..8- 25
Air Cleaner ........................................................................\
............................8- 26Filter Replacement ........................................................................\
.........................8- 26
Climate Control Air Filter ........................................................................\
.....8- 28Filter Inspection........................................................................\
.............................. 8-28
Filter replacement
........................................................................\
.......................... 8-28
Wiper Blades ........................................................................\
........................8- 29Blade Inspection ........................................................................\
............................8- 29
Blade Replacement ........................................................................\
........................ 8-29
Battery ........................................................................\
................................... 8- 31For Best Battery Service ........................................................................\
................8- 32
Battery Recharging ........................................................................\
........................ 8-32
Reset Features
........................................................................\
................................ 8-33
Maintenance
8. Maintenance
8

08
8 -7
Follow Normal Maintenance Schedule if the vehicle is usually operated where none of
the following conditions apply. If any of the following conditions apply, you must follow
the Maintenance Under Severe Usage Conditions.
• Repeated short distance driving.
• Driving in dusty conditions or sandy areas.
• Extensive use of brakes.
• Driving in areas where salt or other corrosive materials are used.
• Driving on rough or muddy roads.
• Driving in mountainous areas.
• Extended periods of idling or low speed operation.
• Driving for a prolonged period in cold temperatures and/or extremely humid
climates.
• More than 50% driving in heavy city traffic during hot weather above 90°F (32°C).
• Engine oil usage which is not recommended (semi-synthetic, mineral type, lower
grade spec, etc.)
For additional information or assistance see your authorized HYUNDAI dealer.
NOTICE
After 10 years or 100,000 miles, we recommend to use severe maintenance
schedule.
Scheduled Maintenance ServiceS

Maintenance
8-8
Normal Maintenance Schedule (Smartstream G1.6 T-GDi)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Drive belts
*1
At first, inspect at 48,000 miles (78,000 km) or 72 months.
Thereafter, inspect every 8,000 miles (13,000 km) or 12 months
Engine oil and engine oil filter
*2
R R R R R R R R R R R R R
Fuel additives
*3
Add fuel additives every 8,000 miles (13,000 km) or 12 months
Air cleaner filter I I R I I R I I R I I R I
Air intake hose I I I I I I I I I I I I I
Spark plugs RR
Rotate tires Rotate every 8,000 miles (13,000 km)
Climate control air filter R R R R R R
Vacuum hose I I I I I I I I I I I I I
Engine coolant At first, replace at 120,000 miles or 120 months.
Thereafter, replace every 30,000 miles or 24 months
R: Replace or change.
I : Inspect and if necessary, adjust, correct, clean or replace.*1 : The drive belt should be replaced when cracks occur or tension is reduced excessively.
*2 : Requires API SN PLUS (or above) grade engine oil. If a lower grade engine oil is used, then the engine oil and engine oil filter
must be replaced at every 5,000 miles (8,000 km) or 6 months as indicated for severe maintenance condition.
*3 : If TOP TIER Detergent Gasoline is not available, one bottle of additive is recommended. Additives are available from your
authorized HYUNDAI dealer along with information on how to use them. Do not mix other additives.

08
8-9
Normal Maintenanc e Schedule (Smartstream G1.6 T-GDi) (CONT)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Battery condition I I I I I I I I I I I I I
Brake lines, hoses and connections I I I I I I I I I I I I I
Disc brakes and pads I I I I I I I I I I I I I
Driveshaft and boots I I I I I I I I I I I I I
Suspension mounting bolts I I I I I I I I I I I I I
Air conditioner refrigerant I I I I I I I I I I I I I
Air conditioner compressor I I I I I I I I I I I I I
Exhaust pipe and muffler I I I I I I I I I I I I I
Automatic transmission fluid No check, No service requiredR: Replace or change.
I : Inspect and if necessary, adjust, correct, clean or replace.

Maintenance
8-10
Normal Maintenance Schedule (Smartstream G1.6 T-GDi) (CONT)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Intercooler, in/out hose First, inspect 5,000 miles (8,000km) or 6 months,
After that, inspect every 20,000 miles (32,000km) or 24 months
Steering gear rack, linkage and boots I I I I I I I I I I I I I
Vapor hose, fuel filler cap and fuel tank I I I I I I
Fuel tank air filter *
5
I I I I I I
Fuel filter *
5
I I I I I I
Fuel lines, hoses and connections III
Parking brake I I I I I I
Brake fluid Inspect every 8,000 miles (13,000 km) or 12 months,
Replace every 48,000 miles (78,000 km) or 48 months
R: Replace or change.
I : Inspect and if necessary, adjust, correct, clean or replace.*5 : Fuel filter & Fuel tank air filter are considered to be maintenance free but periodic inspection is recommended for this
maintenance schedule depends on fuel quality. If there are some important safety matters like fuel flow restriction, surging,
loss of power, hard starting problem, etc. replace the fuel filter immediately regardless of maintenance schedule and consult an
authorized HYUNDAI dealer for details

Maintenance
8-12
Normal Maintenance Schedule (Smartstream G2.5 GDi)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Drive belts
*1
At first, inspect at 48,000 miles (78,000 km) or 72 months.
Thereafter, inspect every 8,000 miles (13,000 km) or 12 months
Engine oil and engine oil filter
*2
R R R R R R R R R R R R R
Fuel additives
*3
Add fuel additives every 8,000 miles (13,000 km) or 12 months
Air cleaner filter I I R I I R I I R I I R I
Air intake hose I I I I I I I I I I I I I
Spark plugs Replace every 96,000 miles
Rotate tires Rotate tires every 8,000 miles (13,000 km)
Climate control air filter R R R R R R
Vacuum hose I I I I I I I I I I I I I
Engine coolant At first, replace at 120,000 miles or 120 months.
Thereafter, replace every 30,000 miles or 24 months
R: Replace or change.
I : Inspect and if necessary, adjust, correct, clean or replace.*1 : The drive belt should be replaced when cracks occur or tension is reduced excessively.
*2 : Requires API SN PLUS (or above) grade engine oil. If a lower grade engine oil is used, then the engine oil and engine oil filter
must be replaced at every 5,000 miles (8,000 km) or 6 months as indicated for severe maintenance condition.
*3 : If TOP TIER Detergent Gasoline is not available, one bottle of additive is recommended. Additives are available from your
authorized HYUNDAI dealer along with information on how to use them. Do not mix other additives.

08
8-13
Normal Maintenance Schedule (Smartstream G2.5 GDi) (CONT)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Battery condition I I I I I I I I I I I I I
Brake lines, hoses and connections I I I I I I I I I I I I I
Disc brakes and pads I I I I I I I I I I I I I
Driveshaft and boots I I I I I I I I I I I I I
Suspension mounting bolts I I I I I I I I I I I I I
Air conditioner refrigerant I I I I I I I I I I I I I
Air conditioner compressor I I I I I I I I I I I I I
Exhaust pipe and muffler I I I I I I I I I I I I I
Automatic transmission fluid No check, No service required
Steering gear rack, linkage and boots IIIR: Replace or change.
I : Inspect and if necessary, adjust, correct, clean or replace.

Maintenance
8-14
Normal Maintenance Schedule (Smartstream G2.5 GDi) (CONT)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156
Miles×1,000 8 16 24 32 40 48 56 64 72 80 88 96 104 Km×1,000 13 26 39 52 65 78 91 104 117 130 143 156 169
Vapor hose, fuel filler cap and fuel tank I I I I I I
Fuel tank air filter *
4
I I I I I I
Fuel filter *
4
I I I I I I
Fuel lines, hoses and connections III
Parking brake I I I I I I
Brake fluid Inspect every 8,000 miles (13,000 km) or 12 months,
Replace every 48,000 miles (78,000 km) or 48 months
R: Replace or change.
I : Inspect and if necessary, adjust, correct, clean or replace.*4 : Fuel filter & Fuel tank air filter are considered to be maintenance free but periodic inspection is recommended for this
maintenance schedule depends on fuel quality. If there are some important safety matters like fuel flow restriction, surging,
loss of power, hard starting problem, etc. replace the fuel filter immediately regardless of maintenance schedule and consult an
authorized HYUNDAI dealer for details.