I'm about to do my first oil change since buying my CRD so I've been looking for a good value for money oil that meets MB 229.51.
This has got me thinking! There are a few different oils that meet 229.51 ranging wildly in price and even weight, for example Mobil 1 is available in 5w-30 and 5w-40 but both meet 229.51.
I'm curious to know what 229.51 actually specifies, is it just the low ash properties required for the DPF or does it specify properties required for properly lubricating, cooling, cleaning the engine?
If 229.51 is an ultimate, exhaustive specification for the oil then I'm tempted to use GM Dexos 2 which claims to meet this standard but is significantly cheaper. If its just an ash spec then I'm more inclined to shell out the big bucks for a premium brand.
Any feedback gratefully received!