Two problems related to crankcase (pcv) have been reported for the 2015 Kia Motor Optima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 Kia Motor Optima based on all problems reported for the 2015 Optima.
Excessive oil consumption. No visible leaks, took to the dealer once and they replaced the pcv valve. Since that point the car uses a quart within a weeks time. No leaks, no smoke. Used for ordinary everyday highway driving. 40 miles a day round trip.
I was driving my car on the freeway and when the speed hit 60mph the car stalled and alot of smoke came out of the exaust. The card behind me had to slow down. I managed to pull over to the side and the check engine light came on and the car shut off. I turned it on and the check engine light was not on anymore and the car made smoke. I called comunity kia on baytown and they said there was a bad pcv valave that had to be replaced. I paid for it and they replaced it and as I drove off home the car kept doing the same and stalling. I called the dealer and they told me they had to do an oil consumption test. The first test my car was low 2 quarts and they said the car was fine. "it lost 2 quarts but we dont know where its going" I told her it didnt feel safe to drive I didnt want it to catch fire and she said the car was fine. Than I drove it 600 miles and the car threw a whole lot more smoke and the engine was knocking and I took it back to the dealer. They said it was fine and the smoke I claimed was coming out was not. That the technicians turned it on and drove it did not see any smoke. I showed up to the dealer and turned it on and smoke came out and pressed on the gas and a huge cloud came out. They told me it was unbelievable. So now they want me to get a new engine and say its because I failed to do the oilchange.