DIFF FLUID CHANGE TIP>>>>>>>>>>>Used this on my MGB and realized it will work on the w210 when servicing the rear differential fluid.So maybe add it in your tool box.Made pumping in the dif fluid a piece o cake

At Wal-Mart they sell a little hand pump for adding oil to the lower unit of an outboard motor. You can find it in with the outboard motor oil and service stuff. This pump screws right on to the top of the bottle of Diff lube when the little pointy spout is removed. Simply pump the oil into the fill plug hole until it runs out.
less than 10 bucks,time and energy saved priceless

ohlord

diy section has that great write up on the change,thought this little tool is a nice addition to the text.