The usefulness of oil splash lubrication is seriously depending on the velocity on the gears. A typical rule of thumb is a tangential speed of at least three m/s is required in order for splash lubrication to be productive. This treatment is suitable for use in all sorts of differentials https://gunnerbwmfu.ampedpages.com/the-5-second-trick-for-gearbox-oil-treatment-61094257