Hi guys, hope I have not made a hash of this as I am a newcomer. I have a 05 bmw 730d and am experiencing problems with it. When I start it in the morning cold weather +3 degrees it says on the computer, it goes fine up to about 40mph and when I accellerate the revs go up but the speed does not, it stays at 40mph and struggles to go over it. This lasts for about 15 minutes and for the rest of the day it runs perfectly. The onboard computer gives no warnings. I have it for about 2 years now and this is the first winter it happened. Anyone else experience this problem.