Blue/White Smoke at Start Up

2006 TDI 17,000 miles. This happened once in a while during the winter, lately I have been seeing this more ofter. About 7,000 miles since my last oil change and I need to add a little. But, I am wonder about the blue/white smoke at start up. Any ideas. Help appreciated.

Mike

See your owners manual.

Completely normal

Will change with the fuel you use (ie bio, winter d2, summer d2)

I have no smoke when i use b50