Dropped

A small hint. Be very careful with the oil filler cap on a BMW. I dropped mine at a gas station into the engine. I had stopped to get some oil as I was a touch low. Trying to hurry, and stay clean, I dropped the cap.

However it didn't come out the bottom. There's a plastic cover on the bottom, a splash guard of some sort. I looked around, but couldn't find it.  So I drove home, thinking I could do better in the garage.

I did, but I had to remove 14 or so screws to pull the cover off, then reach around and get the cap. All of this, with plenty of oil splashed around the engine compartment from the ride home.

Not too long, 15-20 minutes, but a messy procedure.

I've learned to be more careful.