2016 C63s Build
https://mbworld.org/forums/c63-c63s-...service-2.html
So I finally got around to changing the rear diff fluid for the second (or first) time myself after buying the car. I used the part number 001-989-52-03-10 rear diff fluid which come in .5L bottles from any local dealer or online. You will need 3 bottles, but you won’t use the 3rd one entirely. Before anyone says the car has to be perfectly level, it doesn’t. It is completely fine to have a slight over fill using this method.
1. Jack the car from the driver rear as little as you need to get under and access the diff so the drain plug on the passenger side is at the lowest point. Put a jack stand under the car and get to work.
2. Use a 19mm socket and 1/2” ratchet or impact gun with extensions to remove the fill plug on the driver side and then remove the drain plug on the lower passenger side of the diff. Mine were tight af as it looked like mb used thread locker of some sort. Let fluid drain into an appropriate container.
3. Clean both fill and drain plugs with a rag then wipe excess fluid drips from the diff and surrounding area. Replace drain plug and tighten.
4. You can use a fluid pump to add fluid into the diff or you can add fluid using the clear extension tube that comes out of the bottle lid. The bottle wedges upward enough to get all of the fluid out of the bottle. Add two full bottles then add the third until fluid starts seeping out of the fill hole. Wipe clean and tighten fill plug. Clean entire area of excess fluid.
5. Make sure the drain plug doesn’t have any fluid leaking, clean everything up, lower the car down and you’re done!
Last edited by gOt BoOsT; Dec 16, 2018 at 08:14 AM.
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