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I think the LL specs are related to the year they were brought in. LL01 is from 2001 and LL04 is from 2004.
I seem to recall LL01 and LL04 are basically the same oil, but the LL04 has reduced sulphur compound content, in order to ensure the diesel particulate filters (if fitted, not all diesels had them as standard from this period) are not damaged. Not sure if this has any relevance to petrols. In terms of engine /turbo lubrication / protection I don't think there is any decernable difference between LL01/04.
This is all from memory so don't take this as gospel.
(PS I assume you should really be using 0W30 oils, not Mobil 0W40 spec oils - not that theres really a huge difference in performance)
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