2019 Kia Optima

Engine complaints dominate the 2019 Optima's complaint record, with owners frequently describing stalling while driving, excessive oil consumption requiring repeated top-offs between changes, misfires, and in the most serious cases, smoke or fire originating from the engine compartment. The oil consumption pattern comes up across multiple reports, with some owners describing the need to add oil every couple of weeks to keep the engine running. Stalling at speed is another recurring theme, often reported on vehicles with moderate mileage and documented maintenance history. Forward collision avoidance generates the second-highest complaint volume, where owners describe the system triggering unexpectedly or failing to respond as expected. Structure complaints are the third-named category, though the specific symptoms described there are less concentrated. The engine fire reports, while among the more dramatic submissions, appear across more than one filing rather than as a single isolated incident.