To estimate the price of the 2013 BMW M6 V8 4.4L Twin Power Turbo Standard Convertible, I started by looking at the selling price of a similar 2014 BMW M6 sedan with a similar engine and specs, which sold for SAR 144500 in December 2023. Given that the convertible variant typically commands a higher price than the sedan, I adjusted for this difference. The new car prices show that the convertible variant is generally more expensive than the sedan by around SAR 5000. Considering the car's age, I applied a depreciation rate of 10% per year. The 2013 model is one year older than the 2014 model, so I reduced the price by 10%. The car's mileage is lower than the 2014 model, which adds some value back. Taking all these factors into account, I arrived at the final estimate.