How long was it idleing before you hit gas? And was the oil hot(i think normal hot is a little under 210 mark at least on my 4.8is), and coolant at temp?

To be honest id feel 50 max, do they make a 10-50? Or is it just 20-50,

Even better if there was a 10-45. Glad it helped though and it did on mine, i feel like it got better the longer ive been running the oil as now i never see smoke. With the 5-20 it was bad like under 30 sec idle and huge clouds.

Also how many miles on it?

__________________
2006 X5 4.8is Fully Loaded