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The Mercedes GLK 350 with a 3.5 L V6 engine requires 7 US quarts of 5W-30 oil. It is recommended to change the oil and filter every 7,500-10,000 miles or 12 months when using fully synthetic lubricants. If conventional oil is used, the interval should be every 3,000-5,000 miles or 6 months. Synthetic oils offer advantages such as improved lubrication, longer time between service appointments, and better performance in extreme weather conditions. Thinner viscosity oils move more easily in cold weather, providing efficient coating of engine components and better protection against friction and corrosion. The cost for an oil change and filter replacement for the GLK typically ranges from $170 to $200 for parts and labor.
Approximately 9 quarts, equivalent to about 9 liters. MAKE SURE YOU HAVE THAT CORRECT. I recently replaced mine.
Your Mercedes GLK 350 requires 5 liters of 5w-30 synthetic motor oil for optimal performance.