Which brand/weight oil for my Michigan 00' 323ci?

[DTMTuner]

'00 323ci- Which brand Castrol Syntec or Mobil 1, and which weight.?
Keep in mind -30F to +100F range during a normal calendar year.
Thanks in advance,
Mark

[tdc]

I'd go with a good 10W50. Should give you a nice range for your area.

And either one of the brands are fine.

[BimmerD]

I took my 01 325ci to school in Michigan from California. Before leaving, I asked a bunch of questions about what winter weather will do to the car. They told me I didn't have to change a thing. There was no profit to be made by them by lying to me, so I trust them. I went the winter without a hitch.