To estimate the price of the 2015 BMW X6 xDrive 35i I6 3.0L Twin Power Turbo (M Kit) M Sport (Top) with 183000 km mileage, I first looked at the selling price of a similar 2014 BMW X6 xDrive 50i (Top) with 218000 km mileage, which sold for SAR 48000 on 2024-05-25. This car has a higher engine variant but is older and has more mileage. Next, I considered the listed prices of similar cars. The closest match is a 2015 BMW X6 xDrive 35i I6 3.0L Twin Power Turbo (M Kit) M Sport (Top) with the same mileage listed for SAR 95000. However, listed prices are generally higher than selling prices. Other relevant listings include a 2015 BMW X6 xDrive 50i (Top) with 177000 km listed for SAR 85500 and a 2014 BMW X6 xDrive 35i (Base) with 201000 km listed for SAR 44500. Considering the selling price, the listed prices, and the fact that the car in question is in average condition, I adjusted the estimate accordingly.