I was playing around with the Lubrizol oil performance comparison tool and noticed that there are two versions of MB 229.5 (and 229.51) spec: 2009 and 2012. The 2012 version seems to offer better wear protection and aftertreatment compatibility, yet the SA limit didn't seem to change, so how are they achieving this? Also, I'm not happy with this MB spec naming/numbering convention. If you're going to update the spec, you should give it a new number. Otherwise, when you go oil shopping, you'll see 229.5 listed on the label, but you won't know if it's the 2009 version or the 2012 version.