[Sallyz4]

I have an 06 Z4 3.0Si roadster with under 27,000 miles on it, and just got it in August this year CPO from the dealer... Now that winter is here, obviously it's cold as hell out latley and I realized when I start my car when it is cold, it makes an odd noise once the engine turns over... It sounds like a tearing noise, almost as if somebody tore a really large peice of paper into two pieces. However, no warning lights come on, and the engine runs and sounds fine after that initial noise it makes, other than that there are no problems.. Anybody else ever experience this noise, or does anybody have an idea of what it could possibly be? Thanks!