Originally Posted by techlogik
The engines are designed to only last 1 race. They are completed rebuilt afterwards.
As one engine builder put it: "The perfect engine runs flawlessly at it's designed maximum performance the entire race, than right when it crosses the finish line, it implodes."
They used to be. During the recent years rules are changed. I don't remember the exact number of races an engine has to endure, but it is >=2.