See also:

Checking the transaxle oil (manual)
Transaxle lubricant in the manual transaxle should be checked at those intervals specified in the vehicle maintenance schedule in Section 5. Recommended Oil Use only HYUNDAI GENUINE PARTS MTF 7 ...

Hybrid-ness
Before I get into the performance and technology aspects of what makes the Sonata Hybrid tick, I've got to point out the fact that the Sonata Hybrid looks dramatically different from its gasoline- ...

Check Battery and Cables
Winter puts additional burdens on the battery system. Visually inspect the battery and cables as described in Section 6. The level of charge in your battery can be checked by your Hyundai dealer o ...