Hyundai Elantra HD: Change to "winter weight" oil if necessary - Winter driving - Driving your vehicle - Hyundai Elantra HD 2006–2010 Owners ManualHyundai Elantra HD: 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 should use, consult an authorized Hyundai dealer.

Check battery and cables
Winter puts additional burdens on the battery system. Visually inspect the battery and cables as described in Section 7. The level of charge in your battery can be checked by an authorized Hyundai ...

Check spark plugs and ignition system
Inspect your spark plugs as described in Section 7 and replace them if necessary. Also check all ignition wiring and components to be sure they are not cracked, worn or damaged in any way. ...