To estimate the price of the 2015 Porsche Cayenne V6 3.6L Twin Turbo S (Mid), I first considered the selling prices of similar cars. The 2014 Cayenne S V8 4.8L Twin Turbo with 187,000 km sold for 90,000 SAR, and the 2015 Cayenne GTS V6 3.6L Twin Turbo with 138,000 km sold for 110,000 SAR. The 2013 Cayenne V6 3.6L S with 89,000 km sold for 110,000 SAR, but it had lower mileage and was older. The 2014 Cayenne V6 3.6L Turbocharged GTS with 127,000 km sold for 76,500 SAR. The 2016 Cayenne V8 4.8L Turbo Charged with 64,000 km sold for 185,000 SAR, but it is a different variant and newer. The listed prices for similar 2015 Cayenne S models with similar mileage are 153,500 SAR and 93,500 SAR. Considering the selling prices, the 2015 model year, and the high mileage of 257,000 km, I estimate the market price to be closer to the lower end of the listed prices.