You are misunderstanding why I ask such "silly" question.
Guy's car analogy is a faulty one, because a car is not a self-replicating entity, eg it cannot produce offspring.
Life can reproduce, where the parents will pass their genes to the child. Those genes contained the biological makeup of the parents.
Evolution is about genetics, where genetic information are passed to successive generations....
BUT, evolution is not about changes to a single individual, rather that it is change to whole population.
For instance, evolution IS NOT ABOUT change to one individual skinny person, who become fat with eating the wrong diet and not exercising, then losing those extra weight by changing his eating habits and exercising an hour or two each day.
Evolution about the changes some generations later to whole population.
To give you an example.
The last Ice Ages, known as the Quaternary glaciation or Pleistocene glaciation, started around 2.2 million years ago. The ice sheets usually associated with Ice Ages only covered certain parts of Europe and Asia, and North America, and pockets of ice sheets only covered some high altitudes regions, like mountain ranges of the Alps in Switzerland and north Italy or the Andes in South America.
Generally the whole Earth was colder than normal, but the ice sheets of the Quaternary glaciation didn't cover the entire the Earth. To give you an idea what regions were covered and what weren't covered, look at the image below of the northern hemisphere (source: Quaternary glaciation, Wikipedia):
The image depicted in shades of blue, show where the ice sheets covered, and yellow where there were no ice sheets. The palaeoclimatologists called this the Last Glacial Maximum, when the ice sheets its maximum areas, around 26,500 to 19,000 years ago.
Now, the brown bears living in areas living south of the ice sheets, can continue to range, hunt and hibernate as normal in their normal habitats.
But those brown bears that lived in regions covered by ice, would have to adapt in the environment they were living in, through physically and genetically, as well as change in their eating habits.
Some where around 60,000 years ago, there was split in the brown bears population, where the brown bears developed physically so that it can withstand the extended cold periods, the origin of the polar bears -
- their fur became thicker, more waterproof and wind-brown then southern cousin, changed colour to white that enable to blend better with the ice;
- their diet have changed, where they eat more fats from sea seals, which help the polar bears insulated their body from the cold, and give them buoyancy when swimming in the sea;
- they became larger then their southern cousin, longer heads, longer and more powerful limbs that allowed them travel over ice or swim in freezing sea waters;
- and they no longer hibernate during the cold periods because it is cold for centuries or millennia in the region they were living in.
All that, is what make polar bears different from their sister species, the brown bears.
For millennia, the polar bears continued to find mates from their own species, so they can continue survive for generations to come, even during the interglacial periods, where it was warmer in some areas. Some 10,500 years ago, whole regions that were covered by ice sheet melted, but the polar bears that still lived within the Arctic Circle, continued to thrive in the coldest regions on Earth.
That's evolution, adaptation that occurred over long period of times.
Cars cannot reproduce (self-replicating) or passed their genes to the next generation and to next. Which is why Guy Threepwood's analogy of car is not a good analogy of life. The comparison is very superficial and weak.