To estimate the price of the 2018 Mercedes S450 V6 3.0L Twin Turbo with 88000 km mileage, I first looked at the selling prices of similar cars. Two cars with 58000 km mileage sold for 226000 SAR and 215000 SAR in early 2024. Given the higher mileage of the target car, I adjusted the price downwards. Next, I reviewed listed prices of similar cars. A car with 88000 km was listed for 228000 SAR, and another with 91000 km was listed for 255500 SAR. Considering these listings are generally higher than selling prices, I adjusted downwards. Finally, I considered the condition and specs, which are similar to the sold cars. Combining these data points, I arrived at a reasonable market price estimate.