Because I saw the statement that "electric motors need oil changes too" and I wondered what exactly that meant. Please don't assume that every single person in a discussion must have some kind of ulterior motive. I'm not trying to prove anything about the overall maintenance cost of a Tesla. I just want to know what kind of "oil changes" its motor needs and how that fits in with the official maintenance schedule, because I like to know things and that one piqued my curiosity.