Differential or diff oil serves the function of keeping diff parts well-lubricated so that the vehicle will turn properly. When this oil wears out, the diff will stop working at peak efficiency due to poor lubrication. If diff oil is not changed in good time, it can cause extensive diff damage, which will translate into expensive diff repairs.
To minimise the potential for diff damage, it is imperative for vehicle owners to make sure they change their diff oil before it can start causing problems.
