To estimate the price of the 2017 BMW 540 I6 3.0L Twin Power Turbo (M Sports Package) M Sport (Top+), I considered the listed prices of similar cars. The 2018 BMW 540 I6 3.0L Twin Power Turbo, Standard variant with 126000 km is listed for SAR 155500, and another 2018 model with 83300 km is listed for SAR 139000. Given that the car in question is a 2017 model with higher mileage (173000 km) and a higher trim (M Sports Package), I adjusted the price downwards. The higher mileage and older model year would typically reduce the value, but the higher trim level would offset some of this depreciation. Considering these factors, I estimated the market price accordingly.