All Kia products are designed to be operated with 5w-20. In an emergency you can add a different oil weight to get you by, but use as little as possible for as short a time as possible. Change the oil and filter as soon as you can and replace oil with 5w. The heavier oil will not hurt your car, HOWEVER, the tolerances on these engines are so exact that running a heavier oil in your car will actually expand the area between the lubricated parts.
What does this mean to you?
Extended use of the heavier oil will cause oil loss and smoking as the lighter 5w oil leaks into the cylinder and is burned at combustion.
or mopil xhp that's very good the 2003 kia optima uses 5w-30
WE recommend 5W30
At the bottom of the engine block.
5-20
V6 L14459 or PH9688
3000
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.
The Correct Motor Oil for this vehicle is a 10W40 Synthetic Motor Oil
motor oil
You can use any 5w30 for your Kia
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.