Kia Optima: Checking the Engine Oil Level1. Be sure the vehicle is on level ground.
2. Start the engine and allow it to reach normal operating temperature.
3. Turn the engine off and wait a few minutes for the oil to return to the oil pan.
4. Pull the dipstick out, wipe it clean, and reinsert it fully.
5. Pull the dipstick out again and check the level. The level should be between
F and L.
If the level is near or at L, add enough oil to bring the level to F. Do not overfill.

Use only the specified engine oil. (Refer to “Recommended Lubricants’’ later in this section.)
Changing the Engine Oil and FilterReplacement
1.
Remove the rear wheel & tire.
Tightening torque:88.3
~ 107.9N.m (9.0 ~ 11.0kgf.m, 65.1 ~ 79.6lb-ft)
...
Removal
1.
Remove the battery and the battery
tray. (Refer to "Charging system" in EE group.)
2.
Remove the under cover (A).
Tightening torque:7.8 ~
11 ...
Smart key
With a smart key, you can lock or unlock a door and even start the engine without
inserting the key.
The functions of the buttons on a smart key are similar to the remote keyless
entry. (Refer ...