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According to the 2020 INFINITI Q50 owner's manual, the car's engine cooling system is pre-filled with a mixture of 50% Genuine Nissan long life antifreeze (blue) and 50% water. This blend offers excellent coolant protection year-round and does not require additional additives. It is recommended to stick with this specific coolant mixture to prevent potential damage to the cooling system. If you suspect that your coolant level is low, simply locate the reservoir and check for the minimum and maximum level marks on the side. If the level is near or below the minimum mark, fill it up to the maximum line.
I suggest using Prestone Yellow 50/50 Coolant/Antifreeze, or a similar product, for your INFINITI Q50.