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Not sure but Mobil 1 is an engine oil not gearbox over here in NZ. Quite a different product. Been driving manual cars for 40 years. Never ever changed the gearbox oil in any car or ever had a gearbox or diff problem.
PS From a bearing manufacturer, if a bearing has completely clean grease, it would last for ever. Wearing comes from contaminates. Gearboxes and diffs are sealed and should therefore stay clean.
Engines are quite different. Lots of dirt from the incoming air and combustion by products, hence the need to change.
The stiffness is some other issue.
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