Thanks for the picture Bargain,
that's the cleanest used
7 years old rear differential gear oil I've ever seen.
That's what the transfer case oil should look like @40,000 miles if it's lifetime oil !
makes me wonder that perhaps the rear differential isn't as stressed as the transfer case.
I might be mistaken, but I don't believe the CX9 is full time four wheel drive only when slippage is detected then the rear wheels engage. I know the transfer case is always turning no matter what so maybe that explains the huge difference in oil quality and color.
This might also explain why we rarely or even never see a rear differential failure, always a transfer case issue (usually a leak from the top breather valve @ around 30k/40K mark when the oil starts to decay to sludge and the transfer case overheats).
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