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There's absolutely no risk for the CV to be overloaded ... the grese under pressure is spreaded out from the swivel hub seals (you can see in my pictures a certain amount of grease around the swivel balls) and a little part of it into the differential oil through halfshaft oil seal. This is really not a problem to me because i often drive in mud and water, so i change every 1-2 months the front diff oil (any time it becomes mayonnaise ...)