fuel additives Hyundai Sonata 2020 Owner's Manual

Foreword
1-6
Gasoline containing alcohol or
methanol
Gasohol, a mixture of gasoline and
ethanol (also known as grain alcohol) are
being marketed along with or instead
of leaded or unleaded gasoline. For
example, “E15” is a gasohol comprised of
15% ethanol and 85% gasoline.
Do not use gasohol containing more than
15% ethanol, and do not use gasoline or
gasohol containing any methanol. Either
of these fuels may cause drivability
problems and damage to the fuel
system, engine control system and
emission control system.
Discontinue using gasohol of any kind if
drivability problems occur.
“E85” fuel is an alternative fuel
comprised of 85 percent ethanol and 15
percent gasoline, and is manufactured
exclusively for use in Flexible Fuel
Vehicles. “E85” is not compatible with
your vehicle. Use of “E85” may result in
poor engine performance and damage
to your vehicle’s engine and fuel system.
HYUNDAI recommends that customers
do not use fuel with an ethanol content
exceeding 15 percent.
NOTICE
To prevent damage to your vehicle’s
engine and fuel system:
• Never use gasohol which contains
methanol.
• Never use gasohol containing more
than 15% ethanol.
• Never use leaded fuel or leaded
gasohol.
• Never use “E85” fuel.
Your New Vehicle Limited Warranty
does not cover damage to the fuel
system or any performance problems
caused by the use of “E85” fuel.
Using Fuel Additives (except
Detergent Fuel Additives)
Using fuel additives such as:
- Silicone fuel additive
-Ferrocene (iron-based) fuel additive
-Other metallic-based fuel additives
may result in cylinder misfire, poor
acceleration, engine stalling, damage
to the catalyst, or abnormal corrosion,
and may cause damage to the engine
resulting in a reduction in the overall life
of the powertrain.
- The Malfunction Indicator Lamp (MIL)
may illuminate.
NOTICE
Damage to the fuel system or
performance problem caused by the
use of these fuels or fuel additives may
not be covered by your New Vehicle
Limited Warranty.
Gasoline containing MMT
Some gasoline contains harmful
manganese-based fuel additives such
as MMT (Methylcyclopentadienyl
Manganese Tricarbonyl).
HYUNDAI does not recommend the use
of gasoline containing MMT.
This type of fuel can reduce vehicle
performance and affect your emission
control system.
The malfunction indicator lamp on the
cluster may come on.

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
PROCESS
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

Maintenance8-8
Normal Maintenance Schedule (Smartstream G1.6 T-GDi)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156 168 180
Miles×1,000 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 Km×1,000 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
Drive belts
*1
At first, inspect at 60,000 miles or 72 months.
Thereafter, inspect every 12,000 miles or 24 months
Engine oil and engine oil filter R R R R R R R R R RRRRR R
Fuel additives
*2
Add fuel additives every 6,000 miles or 12 months
Air cleaner filter I I I R I I I R I I I R I I I
Spark plugs Replace every 42,000 miles
Valve clearance
*3
Inspect every 60,000 miles or 72 months
Rotate tires Rotate tires every 6,000 miles
Climate control air filter Replace every 12 months
Vacuum hose I I I I I I I I I IIIII 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 :
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.
*3 :
Inspect for excessive valve noise and/or engine vibration and adjust if necessary. Have an authorized HYUNDAI dealer perform
the operation.

Maintenance8-12
Normal Maintenance Schedule (Smartstream G2.5 GDi)
MAINTENANCE INTERVALS
MAINTENANCE
ITEM Months 12 24 36 48 60 72 84 96 108 120 132 144 156 168 180
Miles×1,000 7.5 15 22.5 30 37.5 45 52.5 60 67.5 75 82.5 90 97.5 105 112.5 Km×1,000 12 24 36 48 60 72 84 96 108 120 132 144 156 168 180
Drive belts
*1
At first, inspect at 60,000 miles or 72 months.
Thereafter, inspect every 15,000 miles or 24 months
Engine oil and engine oil filter R R R R R R R R R RRRRR R
Fuel additives
*2
Add fuel additives every 7,500 miles or 12 months
Air cleaner filter I I I R I I I R I I I R I I I
Spark plugs Replace every 97,500 miles
Rotate tires Rotate tires every 7,500 miles
Climate control air filter Replace every 12 months
Vacuum hose I I I I I I I I I IIIII 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 :
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.

I
I-7
Front seat adjustment ........................................................................\
..................... 3-5Manual adjustment ........................................................................\
.................... 3-5
Power adjustment ........................................................................\
...................... 3-7
Reclining seatback ........................................................................\
.................... 3-8
Front seat head restraints Adjusting the height up and down .................................................................. 3-12
Removal/Reinstallation .................................................\
.................................. 3-13
Fuel Filler Door ........................................................................\
........................... 5-70
Fuel gauge ........................................................................\
...................................... 4-4
Fuel requirements ........................................................................\
.......................... 1-5 Fuel additives ........................................................................\
............................ 1-6
Fuses ..................................................................\
.................................................. 8-46
Instrument panel fuse replacement.......................................\
........................... 8-47
Engine compartment panel fuse replacement ................................................. 8-48
Fuse/relay panel description ........................................................................\
.... 8-49
G
Gauges and meters ........................................................................\
......................... 4-3
Glove box ........................................................................\
.................................. 5-144
Guide to Hyundai genuine parts ........................................................................\
.... 1-3
H
Hazard warning flasher ........................................................................\
.................. 7-2
Hazardous driving conditions ........................................................................\
.... 6-133
Head restraints ........................................................................\
............................. 3-11 Front seat head restraints ........................................................................\
......... 3-12
Rear seat restraints ........................................................................\
.................. 3-14
Headlamp delay function ........................................................................\
............. 5-79
Headlamp leveling device........................................................................\
............ 5-80
Headlamp position ........................................................................\
....................... 5-75
Head-up display (HUD) ........................................................................\
............... 5-72
Heated steering wheel ........................................................................\
.................. 5-44
High Beam Assist (HBA) ........................................................................\
........... 5-76
High beam operation........................................................................\
.................... 5-75
Highway driving ........................................................................\
........................ 6-135
Highway Driving Assist (HDA) ........................................................................\
6-115
Hill-start assist control (HAC) ........................................................................\
..... 6-32
HomeLink
® system ........................................................................\
...................... 5-47
Hood ...................................................................\
................................................. 5-64