You need 229.51 for your CLS cdiJust for info people...Asda selling 5-40 fully synthetic oil for £13 per 5 Litres! MB 229.5
You can get 20 litres of MB 229.51 from eBay delivered for £55 ishIts 229.51 but back up to £23 now! Still a fair price,if you want a wee extra oil change......Just saying...