Hey guys I recently had a second hand diff and controller installed on my A3 however the new unit also wouldn't work, doing a further investigation the garage admitted they only put gear oil in and not haldex oil which has annoyed me, when I turn the car on I hear the pump making churning bubbling noises for about 5 seconds and then it shuts off I've also only got fwd, should I avoid driving the car as I don't know if this oil is going to cause damage to the unit?