Castrol Edge Titanium 5W30 M (previously C3) in my E61 525d (Netherlands).
I've tried one time Shell Helix 5W30 but I noticed the engine wasn't as stable and quiet as with Castrol. Also the turbo was slightly more noticeable. So for me never something else besides Castrol.
Oil change every 25k-30k kms. I only drive long distances (highway).
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