A differential housing for a differential unit of a vehicle. The differential housing is configured for receiving a differential and an end portion of each of two drive shafts connected by means of the differential. The differential housing has a longitudinal axis. It comprises a peripheral wall which has a substantially tubular shape, and defines an inner space. The differential housing includes at least one hole which extends through the peripheral wall; and a valve mounted in said hole, the valve being configured to allow the passage of oil towards the inner space, and to allow the passage of oil from the inner space towards the outside only below a predetermined valve closing force.