To estimate the price of the 2018 BMW 730 Li I4 2.0L Twin Power Turbo with 140138 km mileage, I considered the following data points: 1) Selling prices: A similar car with 92000 km sold for 138000 SAR on 2024-02-27, and another with 101000 km sold for 132000 SAR on 2024-08-12. 2) Listed prices: A car with the same mileage (140138 km) is listed for 138000 SAR, and another with 147000 km is listed for 132000 SAR. Considering the higher mileage of the target car, I adjusted the price downwards from the average of these selling prices and listings. The average selling price is 135000 SAR, and the average listed price is around 135000 SAR. Given the higher mileage and the condition being good, I estimated the price slightly lower than the average selling price.