 The 2012 Kia Optima ex GDI is a sexy looking car comfortable luxury but when I was driving on the free way at 70 mph in the fast lane the engine unexpectally turned off I thought I was going to get in a accident or die on that free way the dealership told me your engine is hurting bad and your entire engine needs to be replaced I just got a fresh good synthetic motor oil change it was fine driving but till this happens I miss work I was stuck with my car for 10 hours till I found the number to call the free Kia towing road side assistance by my warranty my Kia has 47,000 miles when it died and I just received it from car max I thought this was a very reliable car I guess not and how can I maintain the transmission since it's not serviceable ? If this new engine seizes again I'm sueing Kia no exceptions and I have my laywer waiting for me to say the word also Kia has poor engines and transmissions only good things are good body and luxury confort that's it.