It does, but it has low HTHS and an ILSAC additive package which is fine but you can get higher HTHS and Euro additive package in other oils they sell which many here favor.
I’d probably switch to C30 or C40 although given your extreme winter climate maybe the average C30 is better for the top end on those incredibly cold starts. Amsoil is probably a good choice or any other with high PAO and good CCS/MRV.
TBH we haven’t seen many instances where an oil can...
One thing to consider is that it’s a Z4M so it’s a fair weather car and probably has been stored for long periods since it’s a 2006 MY car and has 94k miles. Bad gas could be a possibility.
1.29% for Castrol Edge 10W-60 according to 2021 PDS. I don't run Edge, I run the BMW TPT 10W-60 which should be around 1% but most of these engines have run the Castrol for the bulk of their lives.
I'm not sure if it's coolant. I don't think I'm losing any, plus S54 almost never leaks coolant into the cylinders being closed deck with wide spacing to the coolant openings, and I see this on all 6. Also, my last UOA showed no signs of coolant.
This is from a BMW S54 engine with 94k miles. I just bought it 3k miles ago. The engine looks reasonably clean under the valve cover so I think it's had regular oil changes. Not sure what's going on here though. Any thoughts?