I started by looking at the selling prices of similar cars. The closest match is the 2018 BMW X6 xDrive 35i (Base) with 159000 km sold for 153000 SAR and 150000 SAR in October 2023. Given the target car is the M Sport (Top) variant, it should be priced higher. The 2019 BMW X6 M Sport (Top) with 18000 km sold for 127000 SAR in March 2024, but the mileage is significantly lower. Considering the higher mileage of the target car (185000 km), I adjusted the price downwards. The listed prices for similar cars range from 105500 SAR to 163500 SAR, with the closest match being a 2018 BMW X6 M Sport (Top) listed for 163500 SAR. Factoring in the higher mileage and the fact that listed prices are usually higher than selling prices, I estimated the market price accordingly.