I started by examining the selling prices of similar cars. The most relevant data point is the 2012 BMW 730 Li I6 3.0L Twin Power Turbo with 219194 km, sold for 40500 SAR in June 2024. This car is similar in variant and condition but has higher mileage. Another relevant car is the 2012 BMW 730 I6 3.0L with 159000 km, sold for 54000 SAR in April 2024. This car has similar mileage and variant. The 2012 BMW 730 V6 3.0L Twin Power Turbo Li with 139000 km is listed for 45000 SAR, which is a close match in specs and condition. Considering these data points, the estimated price should be slightly lower than 54000 SAR due to higher mileage and average condition, but higher than 40500 SAR due to lower mileage than the 40500 SAR car. Therefore, I estimate the price to be around 48000 SAR.