The original Mini oil pick-up pipe lives in the right hand edge of the gearbox casing, which is okay if you are driving straight. But during a right hand corner it is possible for the oil to slosh to the left and away from the pick-up. You may notice the pressure gauge dipping during long bends. The likelihood of this happening is increased if the oil level is low.

Starving the engine of oil for only an instant at several thousand RPM can be disastrous. It also has proven to enhance longevity of the oil pump by trapping the tiny pigments of foreign bodies that cause all the wear.

On old remote type boxes the hole that the gauze passes through might need enlarging or the gauze bent away from the reverse idler.