you could probably use a high grade CV joint grease in lieu of the Nissan grease. I doubt the dealers use the genuine grease anyway - because like motor oil, if there's nothing special about the Nissan grease (eg like the BMW E46 M3 you can't just use any diff oil meeting the viscosity spec. The genuine oil has extra friction modifiers and it helps quieten the noise by a lot) then they can get away with a grease from their lube supplier that suits the application. For split boots they'd probably just replace the CV shaft as a whole unit.
Are your boots split?
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