Mazda Mazda3 2019 Owner's Manual page 102

Before Driving
Fuel and Emission
▼ Fuel Requirements (Except Australia)
Vehicles with catalytic converters or oxygen sensors must use ONLY UNLEADED FUEL,
which will reduce exhaust emissions and keep spark plug fouling to a minimum.
The vehicle will perform best with fuel listed in the table.
Regular unleaded fuel
Fuel with a lower rating will negatively affect the emission control system performance and
could also cause engine knocking and serious engine damage.
CAUTION
USE ONLY UNLEADED FUEL.
Leaded fuel is harmful to the catalytic converter and oxygen sensors and will lead to
deterioration of the emission control system and or failures.
This vehicle can only use oxygenated fuels containing no more than 10 % ethanol by
volume. Damage to the vehicle may occur when ethanol exceeds this recommendation, or
if the petrol contains any methanol. Stop using gasohol of any kind if your vehicle engine is
performing poorly.
Never add fuel system additives, otherwise the emission control system could be damaged.
Consult an expert repairer, we recommend an Authorised Mazda Repairer for details.
▼ Emission Control System
This vehicle is equipped with an emission control system (the catalytic converter is part of
this system) that enables the vehicle to comply with existing exhaust emissions
requirements.
WARNING
Never park over or near anything flammable:
Parking over or near anything flammable, such as dry grass, is dangerous. Even with the
engine turned off, the exhaust system remains very hot after normal use and could ignite
anything flammable. A resulting fire could cause serious injury or death.
3-22
Fuel Research Octane Number
90 or above