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LL-01 vs. LL-04
They are compatible, but are not the same. LL-04 is designed to protect the diesel engines' catalysts in the USA (and both diesels and gasoline engines in Europe) by having a much lower SAPS level than LL-01. Sulphur levels in the USA are as much as 100 ppm, while diesel is maximum 15 ppm (standards currently in existence are lowering that gasoline level to levels similar to the diesel standard).
LL-01 in a diesel will trash the cats/dpf. LL-04 in a gas won't do that, but also won't protect the engine as long.
It's kind of silly arguing about it, especially when most people are ignoring BMW's OCI and changing oils at 3K, 5K, 7.5K. The diesel engine OCI recommendation is 10K-13K (13K nominal for my 335d/M57); the gasoline is higher (15K iirc - these are all old numbers, btw.) If a gas engine is filled with LL-04, you probably should change it before 7.5K, because it has less TBN than LL-01 and will be "used up" sooner than later.
Blackstone is your friend. Be sure to ask them to include your TBN and TAN so that you can interpret the oil life properly.
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