Very common. Had an ex who felt that way about her Civic. 'They're indestructible' she used to say - why do I need an oil change?....but figured that they were just trying to get her money
Too many PhDs in this country , universities print themWorked with a woman, PhD no less, who bought a new Chrysler Corp van in the 90's. She'd get oil change mailings from the dealer, but figured that they were just trying to get her money and said that she added oil when it needed it. At the time I had a Dakota pickup with the V-6 that never used oil, and told her so. She finally got the oil changed at 10 or 15k miles (6000 or 7500 mile/6 month changes) I think. Minimum knowledge of mechanical items afflicts a whole lot of people.