Hyundai Sonata: Fuel requirements

Sixth generation YF (2011–2018) / Hyundai Sonata YF 2011-2018 Owner's Manual / Introduction / Fuel requirements

Your new vehicle is designed to use only unleaded fuel having a pump octane number ((R+M)/2) of 87 (Research Octane Number 91) or higher.

Your new vehicle is designed to obtain maximum performance with UNLEADED FUEL, as well as minimize exhaust emissions and spark plug fouling.

CAUTION

Never add any fuel system cleaning agents to the fuel tank other than what has been specified. (Consult an authorized HYUNDAI dealer for details.)

WARNING

Do not "top off" after the nozzle automatically shuts off when refueling.
Tighten the cap until it clicks one time, otherwise the Malfunction Indicator Light “” will illuminate.
Always check that the fuel cap is installed securely to prevent fuel spillage in the event of an accident.

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