A car is conceptually a car based on a lot of characteristics, including it’s ability to be driven.
Just like a tree is a conceptually a tree based on many characteristics, including its leaves.
Using that example, it is part of the nature of trees to lose their leaves in the Autumn, but they are still trees, even without their identifying leaves. Even when they die, and produce no leaves but still stand in the forest.
Cars are machines, and one of the things that happens to machines is that they wear out.
But it is still a car, even if it is a worn out car.