The car in question is a 2013 GMC Terrain V6 3.6L SLT1 with average condition and 137860 km mileage. The most relevant selling price is for a 2014 GMC Terrain SLT AWD 3.6L V6 with 162800 km, sold for AED 25000 in December 2023. Another relevant data point is a 2015 GMC Terrain SLT2 3.6L V6 with 129000 km, sold for AED 27000 in July 2024. Considering the 2013 model year and average condition, the price should be slightly lower than the 2014 model. The 2012 GMC Terrain SLT1 2.4L I4 sold for AED 21000 in March 2024, which is a lower trim and engine size. The listed price for a 2013 GMC Terrain V6 3.6L SLT1 with 71506 km was AED 25000, delisted in September 2024, indicating a higher price due to lower mileage. Considering these factors, the estimated market price for the 2013 model with higher mileage and average condition is AED 23000.