Penrite GB40 is a multigrade gearbox oil designed specifically for use in vehicles that originally used the same oil in the gearbox as was recommended and used in the engine. Many vehicles manufactured in the fifties and sixties specified a monograde engine oil for use in the gearbox. Whilst this was convenient at the time, a multigrade oil is now a better alternative, providing wider temperature performance.
Penrite Gearbox Oil 40 is suitable for older gearboxes of either straight cut, synchromesh, epicyclic design or for overdrives such as Laycock. This gearbox oil contains no EP additives or friction modifiers. Also those vehicles fitted with pre -selector gearboxes. It is a 25w-70 oil designed for use where SAE40 or 50 oils were originally specified.