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The 2010 Mercedes GL450 requires a 50/50 mix of coolant and antifreeze in its coolant reservoir. You can opt for a generic store brand or a well-known one like Preston; however, many drivers choose the original equipment manufacturer (OEM) brand from Mercedes for optimal performance. The reservoir has a capacity of 9.5 US quarts, so you will need to buy two large jugs to completely fill the engine. If you decide to tackle this task yourself, the cost of the fluids can vary between $25 and $60 depending on the brand you select.
The recommended coolant for the 2010 Mercedes GL450 is a mixture of half concentrated coolant and half distilled water.