To estimate the price of the 2018 Mercedes GLS500 V8 4.7L Twin Turbo with 183000 km mileage, I first considered the selling price of a similar 2017 model with 145054 km mileage, which sold for SAR 153000 in September 2023. Given the additional year and higher mileage, I adjusted the price downwards. Next, I looked at the listed prices of similar cars: a 2018 model with 183000 km listed for SAR 160000, and another 2018 model with 181000 km listed for SAR 174500. These listings are higher than the selling price, so I adjusted downwards. I also considered a 2016 model with 156000 km listed for SAR 133000 and a 2017 model with 145054 km listed for SAR 165500. The 2017 model with 137000 km listed for SAR 260000 was an outlier and not considered. Based on these data points, I estimated the market price by averaging the adjusted values, giving more weight to the actual selling price and the most comparable listings.