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This is just something that happened to me, so not sure if it's really an issuel I put metal valve stem caps on our Land Rover and 3 out of 4 seized to the stem over the years somehow. When I tried to use pliers to turn it, completely ripped the valve stem out, and you know what happened then. My mechanic says don't use metal stem covers...then again, I seem to have them on my porsche, which he sold me... YMMV