To estimate the price of the 2018 Mercedes S450 V6 3.0L Twin Turbo Top variant with 28500 km mileage, I first looked at the selling prices of similar cars. Two similar cars with 58000 km mileage sold for 226000 SAR and 215000 SAR in early 2024. Given the lower mileage of the target car, it should be valued higher. Next, I considered the listed prices of similar cars. A Top variant with the same mileage is listed for 342000 SAR, but this is likely an overestimate. Other Standard variants with higher mileage are listed between 210500 SAR and 317000 SAR. Considering the Top variant and lower mileage, the target car should be valued higher than these Standard variants. Factoring in the lower mileage and the Top variant, I estimate the market price to be around 250000 SAR.