Originally Posted by M3PO
Damn, that sucks, mine sounds just like that. It only seems to do it if it's sitting for more than a day though (which makes leaky check valves seem plausible). I talked to the dealer and they want to do some cold starts. I've been recording them recently but it hasn't happened again because I've been driving it everyday. I only noticed it over the holidays when I wasn't driving the car every day. I've only got 5 months left on my warranty too...
This was posted earlier but, this also sounds like mine:
Sounds EXACTLY like mine did. Check valves didn't sort mine - they were done months before the engine replacement incident.
Get something underway now with your dealer. Ask them to esculate it to BMW Germany and tell them you want an answer and an action plan.
Don't let it drag out...