White Zinfadel

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I'm wondering if some of the outstanding experts here could advise me on White Zinfadel. I've noticed in the wine store that the WZ is refrigerated. I bought a bottle (Turning Leaf, CA) from the grocery store that was not refrigeratad. Should WZ be refrigerated? Or does it depend on the brand? Should it be served cold, chilled or room temperature? Help appreciated!