You’re probably right. That sounds like it’s very possible the oil came from the loose dip stick tube. That dealer needs to start paying better attention to the details. Overlooking things like that make me question the quality of work that was performed. Hopefully everything will be fine now. I’d check the oil regularly for a while to make sure it’s staying in the engine.Thanks! So they said it was just residual oil on the plastic cover they forgot to clean off. I was skeptical. Didn’t argue, but checked my oil in lot before leaving. Entire dipstick tube came out with dipstick. Was sitting in there loose with no o-ring at base. Marched back in, showed service rep, they reinstalled tube with o-ring and it’s now secure. Topped off oil as well. Now question is, was that where oil was leaking? They weren’t clear but I can’t see how it wouldn’t have at least splashed enough for me to see the oil I saw. Glad if so because it’s then not the main seal. And goes to show, HAVE to be an educated consumer. I’m damn sure 90% of drivers would have not known until 5,000 mile oil change, or low oil pressure light came on because it all leaked out.