I have been smelling this on my 2019 with 42K for about 10,000 miles or more. I seem to smell it more when I have been using the AC. When I first noticed it I mentioned it at an oil change and the dealer did a pressure test to test for leaks but nothing was found. They did, however, have to add coolant to the car so their is a leak somewhere but they cannot find anything. I am actually worried about this. I have an extended warranty so whatever it is will be covered but I want it fixed. TIme to go to another dealer to get a second opinion I guess.