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The 2014 Mercedes GL450 requires 0w-40 motor oil, specifically recommended by the manufacturer. This oil is ideal for optimal SUV performance and efficiency. When adding oil during an oil change, around 9 quarts along with a new filter are needed. It is important to check the oil level after refilling to ensure it is sufficient. While Mercedes suggests using Castrol EDGE European Formula Engine Oil 0w-40, other brands can also be used. However, Castrol Edge is known for its quality and beneficial additives that help maintain engine efficiency and lubrication during long drives.
For optimal performance, a 2014 Mercedes GL450 performs most effectively with 0W-40 motor oil.