e39 Oil Change Assistance with Oil & Filter Recommendation

[rufryder]

I already purchased Mobil 1 5w-30 and Purolator Oil Filter (Promise to replace with Mann next time), however at the oil cap under the hood, it says, BMW recommends Castrol. Should I replace Mobil 1 with Castrol? If so, which Castrol to use (in the North EastCoast - cold winters) or can I use the Mobil 1 this time and replace it with Castrol? Or bad idea?

 

[Big Daddy]

BMW recommends Castrol because that is who they currently contract with for their oil (BMW Oil = Castrol Oil), in the early 90's it was Mobil 1. Use the Mobil 1 it is at least as good as Castrol.