The car in question is a 2018 Mercedes S450 V6 3.8L Standard with 300,000 km mileage. We have listed prices for similar cars but no actual selling prices or offers accepted. The closest match is a 2018 Mercedes S450 V6 3.0L with 96,500 km listed for AED 180,000 and another with 61,100 km listed for AED 224,500. Given the high mileage of the target car, we expect a significant depreciation. The 2020 models with around 110,000 km are listed for AED 185,000. Considering the age, mileage, and condition, the target car's value is likely much lower. Estimating a depreciation of about 50% from the lower 2018 listing due to the high mileage and condition, we arrive at an estimated price.