Page "Car model" Paragraph 16

Conversely, the marketing department may advertise a car model as a convenient derivative of some popular car, when in fact they may be completely different engineering projects with almost no parts commonality, or from differing generations of the model.

( For example, convertibles are often so heavily engineered, for a relatively small number of sales, that an older generation model is facelifted and carried forward with a new generation of the model's other body styles.

) However, this can also mean that it can change some things.