I have read various articles and searched these boards and articles but I still cant find a definitive BMW document telling me the answer.

Can anyone definitively state what the front/rear precentile power distribution is on pre facelift ( i.e. non xdrive ) X5's ?

I have read reports of 38/62, 66/34 and 50/50. I reckon 38/62 but confirmation or other comments welcomed.