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On Cars with Manual Transmissions, the tranny and the diff share the same oil. Drain and change the tranny oil and you're also changing the diff oil.
On the Tip S cars, the diff uses the same hypoid gear lube as the manual box. But, it must be drained and filled separately from the tranny. There is no drain plug. To drain it, you must 1st remove the axleshaft and then the diff cover, replace gasket and cover, then fill through the fill plug.
As it's a sealed system, with the Tip S, it's probably not necessary to drain/fill it more often than 45-50k mi. or every 5 yrs.
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