The word "Valvuline" has me confused, but I think that you are refering to the oil in the gearbox.

If your 56A dogleg box is making noises, I suspect that it has a problem that needs to be fixed, & fixed soon before it becomes damaged.
These gearboxes are much too wonderfull to allow them to be ruined, so make sure it is full of oil of the correct grade, & if it still makes noise, then replace it with something else untill you can get it properly repaired.