I would recommend the OEM spark plugs, AC/Delco. Excellent plugs.
what kind of car?
no
Ngk br8es
AWSF-32C is the stock plugs
I just put Denso Iridium spark plugs in mine (part #IK16): http://www.densoiridium.com/index.php But these are by no means the only kind of spark plugs you can use. Before these I had SplitFire Platinum.
You must buy BOSCH sparkplugs for this vehicle.
Check the Vehicle Emission Control Information ( VECI ) decal in the front of your engine compartment , it will show what kind of spark plugs to use and the spark plug gap
What kind of Kia?
i would recommend ngk iridium plugs
All depends on what kind of spark plugs you have. It could either be 30,000 miles or 150,000 miles.
look under the hood. there should be a label that tells what kind.
The stock plugs are best