Hyundai Sonata (2009)

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    Checking the Battery
    WARNING: Batteries can be dangerous! When working with batteries, carefully observe the following precautions to avoid serious injuries. The fluid in the battery contains a strong solution of su ...

    Change to "Winter Weight" Oil if Necessary
    In some climates it is recommended that a lower viscosity "winter weight" oil be used during cold weather. See Section 9 for recommendations. If you aren't sure what weight oil you s ...

    Removal and installation
    To remove the headrest, raise it as far as it can go then press the release button (1) while pulling upward (2). To reinstall the headrest, put the headrest poles (3) into the holes while pressin ...