Itís SL probably because of Phosphorous amount. Iíve never seen an A3/B4 5W-30 that is also SN. Looks like a fine oil. Wish we had an A3/B4 10W-30 here in the U.S.!
2007 BMW X5 4.8i, 108k: M1 10W-30 HM, Mann
2012 Mini Cooper, 48k: Castrol 0W-30, Mann (for sale)
2016 Mini Countryman S ALL4, 20k: Castrol 0W-30, Mann