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2016 onwards, the fourth-generation car. It arrived in the mid-2010s with a stiffer body, a much better interior and quieter running, and ran until the K5 took the name at the turn of the 2020s. At this age the service record matters more than the model year: a 2016 with full history beats a neglected 2018.
The Toyota Camry costs far more used and earns most of it, with mechanical faults on 13% of cars against 18% expected for its band, and it is the easier car to own at high mileage. The Mazda 6 is dearer too and the better one to drive, with a lighter panel history at 62% against 51% expected for its band. The Optima gives you the space and equipment of both for a fraction of the money.
Expect a repair history and inspect its quality: 75% of the Kia Optimas we inspect in Saudi Arabia carry evidence of previous body or panel repair, against the 65% we would expect for sedans of the same age and mileage in the Kingdom. Median mileage here is close to 240,000 km — these have covered serious distance in traffic, and cosmetic repair is part of that life. The class is the same: the Hyundai Sonata, the Optima's mechanical twin, runs at 68% against 55% expected for its own band. What you are looking for is structural repair hidden behind cosmetic paint.
Read the body and structural findings before you make an offer. At this mileage the difference between two cars is how they were repaired and maintained.