Many people do not change their differential fluids, every O&M does require
changing it. I change mine once a year weather I need it or not. It also
provides a snapshot of you gear wear. I have never had a failure and I do
alot of off roading. It is cheep to do, easy to do and it is a good thing
to do so why not do?
Because gear oil breaks down over time just like engine oil. While not
subjected to the dirt and contaminants of an engine, it's still placed under
extreme pressures, and will accumulate metal shavings from gear and bearing
wear, and clutch material from limited slips.
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