My point is, there have been Z owners who've refilled both their tranny and diff with the SAME lubricant. Your comment, "diff fluid is the same" could be misconstrued and I wanted to be accurate. Visually speaking, I've found Redline MT85 (my gearbox lube of choice) is quite a bit lighter, almost honey colored, than the darker hues of synthetic diff fluids from Valvoline or Motul.
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