One problem related to loud engine noise has been reported for the 2018 Kia Motor Optima. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2018 Kia Motor Optima based on all problems reported for the 2018 Optima.
My engine started making a horrible noise and jumpimg. The oil was just changed and is fine. Having to replace engine and only had car 2 months.