Hyundai Sonata: Spark plugs
Make sure to install new spark plugs of the correct heat range.
Air cleaner filter
A Genuine HYUNDAI air cleaner filter is recommended when the filter is replaced. ...Valve clearance
Inspect excessive valve noise and/or engine vibration and adjust if necessary. An authorized HYUNDAI dealer should perform the operation. ...See also:
Closing
WARNING
To prevent possible personal injury, always
keep hands and fingers away from the trunk/cargo compartment opening when
closing the
trunk lid/tailgate. Be especially careful when
sm ...
Octane rating tips
Using unleaded gasoline with an octane
rating lower than recommended can cause
persistent, heavy “spark knock.” (“Spark
knock” is a metallic rapping noise.) If severe,
this can lead to eng ...
Fuel E85 (85% Ethanol)
Vehicles that have a FlexFuel badge and a yellow fuel cap can use either unleaded gasoline or ethanol fuel containing up to 85% ethanol (E85).
For all other vehicles, use only the unleaded gasoline d ...