And to keep going...car manufacturers do use engines from other brands, but that's when they are owned by the same company. For example, you'll find Ford engine

And to keep going...car manufacturers do use engines from other brands, but that's when they are owned by the same company. For example, you'll find Ford engines in Mazdas because Ford owned Mazda (or at least a chunk of it): https://en.wikipedia.org/wiki/Mazda#Partnership_with_Ford_Motor_Company https://en.wikipedia.org/wiki/Mazda#Partnership_with_Ford_Mo...