Okay, a couple of things:
- if there is only one prize car for a series or an event, once you win it, that's it. You don't get a car the next time.
- if there are multiple prize cars for a series or an event, you can win cars every time you win that series or event.
- in series, you must win the series, and not just the invidual events within the series, to win the car.
Does that make it any clearer?