Change to "winter weight" oil if necessary
Hyundai Sonata / Sonata 2011 Owners Manual / Driving your vehicle / Winter driving / 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 8 for recommendations. If you aren't sure what weight oil you should use, consult an authorized HYUNDAI dealer.
See also:
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 ...
Tires and wheels
...
Checking the engine oil
Engine oil is essential to the performance and
service of the engine. It is suggested that you
check the oil level at least once a week in normal
use and more often if you are on a trip or driving
...