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I diff with zero oil would make a hell of a whining sound and I don't think it would make it a few hundred miles, thought I don't know since I have no experience with someone driving without diff oil. I can understand if the oil was low, but with none, not going to get too far. If it leaked out, there should be signs of the leak since water is not going to wash it completely off. The method to check the fill level has been the same for many many decades so hopefully the shop knows how to check it properly.
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