Rear Diff Fluid Change AUDI A4/A5 B9

Tutorial on how to change the rear axle oil in a Audi A4 B9 / A5 B9 What you need: -1L of 75w90 GL5 axle oil -in my case 2x rear diff plug (OEM) N90281802 -hex 5 with a small rachet -small torque wrench