The chain Tensioner part number : 11-31-7-839-053 they changed both tensioners. Since then I had no noise issues.
Originally Posted by FormulaMMM
This is probably sage advice.. And I suppose it's worth considering that in a car with sensors galore, the issue doesn't trigger a check engine light. Engine runs flawlessly.
I had the car at the dealer last weekend in an attempt to get them to formally document and diagnose the issue. I reported it under warranty twice, documented with a video. So 5 cold starts later at the dealer, including a few with me on site, and no noise. Happens almost every morning, just not while at the dealer. Damn car.
They searched every BMW service database available to them in an effort to find a related bulletin, notice, something pursuant to this noise. Nothing found.
Yes, please post. Thanks.