The first axle I had a shop replace forme which I garauntee you they most likely they did not but the second axle I let my school's auto class change it while I helped. We didnt expect a lot of fluid to leak out so I didnt bring any fluid with me. It has only been one week since the scond axle change so most likely it needs to be drained and refilled. As for the brand I am kinda skeptic on using non dealer fluid but just need some reassurance from others on what to use.