I am the second owner of a 2004 Kia Optima that I purchased on 2/4/06. I had a 5 year or 60, 000 mile warranty. My engine started to make a rattling noise when I started it up cold so I took it into a Kia dealership on 10/30/06 with 18, 979 miles on it. They replaced lifters in my engine, which I have been told is not a good practice with such low mileage. On 11/20/06 my car started to make the same noise, so I took it back to a Kia dealership. At that time I had to leave it overnight and then when I returned they told me that I needed an oil change, which I paid for. They also said that I needed to get oil changes more frequently and then the noise would eventually go away. So after that I did get oil changes more frequently then normal. I then took my car into another Kia dealership for an oil change, and I asked them to listen to my engine noise again. They claimed that they couldn’t hear it or duplicate it but that I should continue to get more frequent oil changes. I then continued to get regular oil changes but didn’t have any other problem with my car aside for the engine noise that I was told would go away with enough oil changes. I recently took it in for an oil change to a non Kia dealer and was notified by them that my engine noise was because of collapsed lifters at the very least. I then took it into a Kia dealership where they notified me just from listening to it that I indeed had upper and lower engine noise and that I would need a new engine. My car is now not under warranty but they claim that the three times that I took it in for the same problem was not enough. I have gone through the Kia chains of command and been denied.