Only if oil generally only needed to be replaced once or twice over the lifespan of a car, an oil change was traditionally so easy and convenient that most cust

Only if oil generally only needed to be replaced once or twice over the lifespan of a car, an oil change was traditionally so easy and convenient that most customers did it themselves, and the "expensive repair", in absolute terms, was only slightly more expensive than the retail price of oil change parts and supplies for otherwise comparable cars. So no, not really.