I entered my reg no. (mine's a 30d) on the Castrol site and it recommended either Magnatec Stop-Start 5W-30 C3 or Magnatec 5W-40 C3.
The BMW oil is now from Shell rather than Castrol.
On the Shell site, for my reg it recommended Helix Ultra ECT C3 5W-30 or Helix Ultra Professional AM-L 5W-30.
For the 30d you need 6.5 litres and it tells you that on both sites too.
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