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Guys,Anyone knows the difference? Which one is "better" in terms of protection & smoothness (@cold & hot), fuel consumption, etc if I limit the choice to within Q8 only, E46 N42, 10K km service interval? All fully synthetic below.Q8 Formula Special 5w/30 -- BMW Longlife (LL) 04Q8 Formula F1 10W-50 -- BMW Special Oil (developed for the British Touring Car Championships)Q8 Formula Excel 5W-40 -- BMW Special OilAnd does anyone know the significance of the numeric number behind the BMW LL? I saw some oil has BMW LL01 certification, some LL04 as above, some LL08?!