The most relevant data point is the selling price of a 2014 BMW M6 V8 4.4L Twin Power Turbo sedan with similar specs and condition, which sold for SAR 144,500 on 2023-12-08. This car has a slightly lower mileage of 127,000 km compared to the target car's 136,500 km. Given the higher mileage of the target car, a slight depreciation adjustment is necessary. The accepted offer for the same car was also SAR 144,500, confirming the selling price. The listed price of a 2013 model with lower mileage is SAR 104,500, but it is a convertible, which typically has different market dynamics. Considering these factors, the estimated market price for the target car is slightly lower than the SAR 144,500 selling price due to the higher mileage.