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I thought this would be useful for anyone looking to change their rear differential oil. What I found very interesting was that when the oil was released from the housing it was gray in color due to the "break in" process of the differential (according to the FordTechMarkuloco. He suggested servicing the fluid first at 30,000 miles because of this, 60,000 miles after, and every 60,000 miles after that. Very interesting stuff and a lot simpler to do compared to the 3G Ford Escape.