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I just obtained access to the official TSB for replacing the rear differential under warranty and under misc items and fluids they list part number 83-22-2-357-992 as the correct oil replacement. I believe this oil does not include friction modifiers shown as +FM on the label of -282-583 (and possibly -365-988). Apparently there may be another bulletin that goes into more depth on this, but I could not find it. Will no more on that later.
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