Needed to top up the SLS suspension on the W123 today and went to Imparts for it. Brand is Febi. Cost was a reasonable $10.55/litre. I have no idea of the MB price, however I have seen it on eBay for $55.00 for 3 x 1lt bottles, plus $10 postage, so if you are in need of a top-up, Imparts seems the place to go. They are in all states, and their national number is 1300 467 278.