Assuming you don’t have a leak, the best choice for your car’s cooling system is to drain and refill with the Volvo antifreeze specifically made for your car. Chances are that is what is in there now. Mix 50/50 with distilled water. Good time to do a flush too.
If you simply prefer to top it up with the clear premix - go for it.
That begs the question, why is the reservoir dry? Is the cap or tank leaking? Check it out. Doubtful it is a hose as Volvo hoses usually last a very long time…
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Will I buy another Volvo??? We'll see....
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