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I guess if you can find out if the Service Interval is shows as "Lifetime" for the differential fluid, then something was enabled or turned on in the DME or what ever module determines the CBS.
Might need NCSExpert to sort it out.
If I have time, I will check with a few of my tools.
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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.
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