After getting my X back from the dealer I talked to the service manager about the problem. he indicated that the M62 engine had a permanent fix by rerouting the vent hoses under the valve covers but this required 15 hrs of work ( est cost 3,000.00) but with the N62( 2004 onward) engine this did not work . I have had heated hoses already on my engine and these did not work because if there was any spots not heated the hoses froze up. These were installed by BMW

This latest fix from BMW is to insulate all the hoses, valve from the crank, seperator and return lines .This fix was out from BMW in April'07 and i am one of the first ones around here to have this fix. I don't believe it will work either. I think the only fix is to heat the hoses. I will try however and will be going to Calgary ( about 300 km) next week. If it is 20 below I'll know whether the fix has worked. I think x5 in AK has it right. Can you install some pictures so I can see what you have done