Quote:
Originally Posted by JCL
[*]I remember one poster here who had a failed differential. That one was due to the poster changing the fluid, and precipitating the failure. There may have been other diffs replaced, but I think they were early hour, and due to manufacturing defects.
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Strangely I think he's referring to me! I changed both my front and rear diff oils @ 86K miles from the factory Castrol XAF to Castrol Syntec 75w-90. I'm not certain but just changing the fluid didn't lead to the diff failure, instead it was a leaky input seal that lead to its demise. Had I paid greater attention there, I probably wouldn't have had to replace it. My reasoning: the newer, less viscous oil, more easily leaked out of the seals than did the old stuff as I was sauntering down the motorway at a calm 110mph.
Albeit, the old stuff looked quite good for 85K miles - still had a golden brown color.
But as JCL has schooled me in the past, color doesn't equate to the effectiveness of the oil.
In the end, I found a junkyard unit with 18K miles on it and my indy filled it up with the Catrol XAF stuff. Did the same for the fronts, just for good measure. I now have 124K miles and no issues since.