[mdm9]

I recently changed the oil, I put in LiquiMoly GT1 10w-60. Then today, I went to top off the oil, opened the oil fill cap and saw this. It seems like there is a dark film coating everything. Pics attached.

I'm at just over 80k and my car is an 09 e90. The car in the oil changing tutorial I followed didn't seem to have this, at least as far as I could tell from the photos.


Any ideas what this is?
All help appreciated!