Check the oil/crankcase fill cap. Most vehicles nowadays only require 5W-20, maybe 5W-30....of course, weather conditions can affect the oil you should use though!
WE recommend 5W30
or mopil xhp that's very good the 2003 kia optima uses 5w-30
At the bottom of the engine block.
5-20
V6 L14459 or PH9688
3000
What engine oil is recommended for kia Rio 2007
4 cylinder 2.4 litters uses 10W40
The plug on the same side of the motor that the drive belts is on, which should be the passager side, is the engine oil. The plug on the opposite side is the transmission oil.
For the 2001 kia optima I have found the oil filter between the front passenger side tire and the engine. You can see it if you turn the wheels all the way to the left, although it helps if the filter cover is a bright color. To change it I had to remove the tire.
Use exactly the weight that is recommended by Kia.
'i have the same car. check the oil you probably need some or you need to get your oil changed. maybe take it for a check up! hope this helps! my kia is always giving me problems!'