Valve clearance
Hyundai Sonata / Sonata 2011 Owners Manual / Maintenance / Explanation of scheduled maintenance items / Valve clearance
Inspect excessive valve noise and/or engine vibration and adjust if necessary. An authorized HYUNDAI dealer should perform the operation.
See also:
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.
...
Folding Rear Seatbacks
The rear seatbacks may be folded to facilitate carrying long items or to increase
the luggage capacity of the vehicle.
WARNING:
The purpose of the fold-down rear seatbacks is to allow you to carry ...