[M3takesNYC]

My car has just over 40k miles on it and for the first 39k miles it literally burned NO oil at all. Always checked regularly and sensor always was perfectly filled between changes.

Lately I have noticed the past few weeks the indicator has dropped a bit and now today dropped more to about half or a little less. Does not tell me to add a quart yet but this is clearly different for my car.

If it burned oil from the get-go than I would not care and I don't care if I have to add oil etc but I care that it seems different for my car.

The thing I have noticed is a black "film" around the oil-fill cap and around the engine in that area.

Was wondering if perhaps the seal is gone on the oil fill cap and is causing vapor or loss of oil through there. I cleaned the film and it came back so something is causing that.

Any thoughts? No oil under the car or anywhere else in the engine bay. I looked all around with a flashlight