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Most Porsche Cayenne owners don't drive the vehicle on a daily basis, so the mileage tends to stay low until the car is older. This is advantageous for those shopping in the used car market, as it's common to find low mileage Cayennes from models that are over a decade old. However, once these vehicles reach high mileage, there are certain issues to be aware of. For instance, Porsche uses plastic coolant lines that can degrade over time due to engine heat, necessitating expensive replacements with aluminum lines costing around $3,500. There are also known problems with the transfer case, sometimes requiring a complete replacement that can cost over $5,000. This issue often arises around the 90,000-mile mark, even though the Cayenne isn't considered high mileage at that point.
The high mileage issues with the 2020 Porsche Cayenne can potentially lead to system failures across the board.