[Coolcat12]

i have a BMW 550i 2013 the m sport variant when i bought the car we noticed bit of a oily smell and didn't think much about it. we start noticing at engine operating temperature when we give it some gas the cabin starts to smell like exhaust fumes and oil. we have done many things we have taken it to the mechanic multiple times and the mechanic changed most of the seals and gaskets like the turbo lines and more. no luck we have no idea what it is and i dont feel like taking it to the stealership we also had the mechanic have a search of the whole car and nothing. please help