My husband changed the plug hoping it would fix it - but it did not - so took to firestone and they also mentioned that the plug is bad and that I should bring to Kia's attention - which I did and they said they don't have any recalls for it - but if I don't really watch the way my car drives - the oil will run out and then my engine will seize. Not ok - I keep up on the oil changes and maintenance and they should have to fix the problem on the faulty part.