Hi Guys Here's a quick guide on changing your diff oil: Why I did it: I changed the diff seals so decided that whilst under the car and in that area, I would change the oil as I might have got some dirt in the diff. Also, the diff was making a noise when turning slow corners so filled it up using the BMW friction modifier oil Parts Needed: 3x 184.108.40.2062.583 - BMW Diff Oil Special Tools Needed: 14mm Allen Key Guide: Step 1 – Jack up car and make sure you have an axle stand underneath it and secure as you will be working underneath it. Step 2 – Place a container underneath the drain plug. Step 3 – Remove the filler plug first (Number 2) as there’s nothing worse than draining the oil, only to find out that you can’t fill it back up again! Step 4 – Remove the drain plug (Number 1) and catch the old oil in the container. Step 5 – Put the drain plug back in. Step 6 – Make sure that the car is level and fill the diff with approx 1.3 litres but when it starts pouring out of the filler hole, that’s when it’s full. Step 7 – Put the filler plug back in and tighten. Step 8 – Drop car back down and take for a spin. Try to go to an open car park and do 10-12 figures of eights to allow the fluid to go through all the diff. Hope that helps!