The differential oil in my 1985 Dana 70 motorhome looked like the original oil. Because of this, I intend to do some short oil change intervals. This eliminates many of the hassles of changing the oil after 1,000 miles or less, saving time and money compared to buying, cleaning and wasting an RTV. After thoroughly cleaning the mating surfaces, installing the gasket and cover, and tightening the bolts to specification, there are no leaks. It remains to be seen how well it holds up through repeated uninstalls and installs, but so far I'm happy with it.
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