2021-2024 Hyundai Bayon SUV Foreword -> Petrol engine User Manual
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Foreword -> Petrol engine for Your Hyundai Bayon SUV Second Generation (2021-2024)

01  
FUEL REQUIREMENTS  
Petrol engine  
Unleaded  
For the optimal vehicle performance, we recommend you use unleaded petrol  
which has an octane rating of RON (Research Octane Number) 95 / AKI (Anti  
Knock Index) 91 or higher. You may use unleaded petrol with an octane rating of  
RON 91-94 / AKI 87-90 but it may result in slight performance reduction of the  
vehicle. (Do not use methanol blended fuels)  
Your new vehicle is designed to obtain maximum performance with UNLEADED  
FUEL, as well as minimise exhaust emissions and spark plug fouling.  
NOTICE  
NEVER USE LEADED FUEL. The use of leaded fuel is detrimental to the cata-  
lytic converter and will damage the engine control system’s oxygen sensor  
and affect emission control.  
Also, severe wear and crack of piston ring, valve, etc., may occur and knock-  
ing noise may be heard from your engine.  
Never add any fuel system cleaning agents to the fuel tank other than what  
has been specified (We recommend that you consult a HYUNDAI authorised  
repairers for details.)  
WARNING  
• Do not “top off” after the nozzle automatically shuts off when refuelling.  
• Always check that the fuel cap is installed securely to prevent fuel spillage  
in the event of an accident.  
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Foreword  
Petrol containing alcohol and methanol  
Gasohol, a mixture of petrol and ethanol (also known as grain alcohol), and petrol  
or gasohol containing methanol (also known as wood alcohol) are being marketed  
along with or instead of leaded or unleaded petrol.  
Do not use gasohol containing more than 10% ethanol, and do not use petrol or  
gasohol containing any methanol. Either of these fuels may cause drivability prob-  
lems and damage to the fuel system, engine control system and emission control  
system.  
Discontinue using gasohol of any kind if drivability problems occur.  
Vehicle damage or driveability problems may not be covered by the manufacturer’s  
warranty if they result from the use of:  
1. Gasohol containing more than 10% ethanol.  
2. Petrol or gasohol containing methanol.  
3. Leaded fuel or leaded gasohol.  
CAUTION  
Never use gasohol which contains methanol. Discontinue use of any gasohol  
product which impairs drivability.  
Using Fuel Additives  
Using fuel additives such as:  
- Silicone fuel additive  
- MMT (Manganese, Mn) fuel additive  
- Ferrocene (iron-based) fuel additive  
- Other metallic-based fuel additives  
May result in cylinder misfire, poor acceleration, engine stalling, engine plugging,  
heavy knocking noise, damage to the catalyst, or abnormal corrosion, and may  
cause damage to the engine resulting in a reduction in the overall life of the pow-  
ertrain. The Malfunction Indicator Light (MIL) may illuminate.  
NOTICE  
Damage to the fuel system or performance problem caused by the use of  
these fuels may not be covered by your New Vehicle Limited Warranty.  
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01  
Use of MTBE  
HYUNDAI recommends avoiding fuels containing MTBE (Methyl Tertiary Butyl  
Ether) over 15.0% vol. (Oxygen Content 2.7% weight) in your vehicle.  
Fuel containing MTBE over 15.0% vol. (Oxygen Content 2.7% weight) may reduce  
vehicle performance and produce vapour lock or hard starting.  
CAUTION  
Your New Vehicle Limited Warranty may not cover damage to the fuel system  
and any performance problems that are caused by the use of fuels containing  
methanol or fuels containing MTBE (Methyl Tertiary Butyl Ether) over 15.0%  
vol. (Oxygen Content 2.7% weight.)  
Do not use methanol  
Fuels containing methanol (wood alcohol) should not be used in your vehicle. This  
type of fuel can reduce vehicle performance and damage components of the fuel  
system, engine control system and emission control system.  
Fuel Additives  
HYUNDAI recommends that you use unleaded petrol which has an octane rating of  
RON (Research Octane Number) 95 / AKI (Anti Knock Index) 91 or higher (for  
Europe) or Octane Rating of RON (Research Octane Number) 91 / AKI (Anti-Knock  
Index) 87 or higher (except Europe).  
For customers who do not use good quality petrols including fuel additives regu-  
larly, and have problems starting or the engine does not run smoothly, one bottle of  
additive added to the fuel tank according to the maintenance schedule (refer to the  
Service Passport in your vehicle).  
Additives are available from your HYUNDAI authorised repairer along with informa-  
tion 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.  
1-7  

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