To estimate the price of the 2017 Changan CS75 I4 1.8L Turbo Charged Plus Limited (Top) with 257000 km mileage, I considered several data points. The closest match is a 2017 Changan CS75 I4 1.8L Turbocharged Plus Limited (Top) with 192000 km sold for 28000 SAR on 2023-12-23. Given the higher mileage of the target car, I adjusted the price downwards. Another similar car, a 2017 Changan CS75 I4 1.8L Turbocharged Plus Limited (Top) with 233000 km, was listed for 18500 SAR but not sold, indicating a lower market interest. Considering these factors and the average condition of the target car, I estimated the price accordingly.