To estimate the price of the 2018 Ford Taurus V6 3.6L SEL (Mid) with 153000 km mileage, I first looked at the selling prices of similar cars. The closest match is the 2019 Ford Taurus I4 2.0L SEL (Mid) with 169000 km sold for 55500 SAR on 2024-01-05. Another relevant data point is the 2020 Ford Taurus I4 2.0L Turbocharged SEL (Mid) with 70000 km sold for 62500 SAR on 2024-04-05. Considering the engine size difference, the V6 variant typically commands a higher price than the I4. Next, I reviewed the listed prices of similar cars. The 2018 Ford Taurus V6 3.6L SEL (Mid) with 153000 km is listed for 48000 SAR, and a 2017 Ford Taurus V6 3.5L SEL (Mid) with 147000 km is listed for 51000 SAR. Given the average condition and mileage, I adjusted the price slightly lower than the listed prices but higher than the selling prices of the I4 variants to account for the V6 engine premium.