You think about where most of the cars you see on the road come from. Here in the US, that's mostly domestic/America, Japan, Italy, and Germany. Is that linked to their industrial build up in World War 2? And if so, why are there no major Russian car manufacturers?
Is that linked to their industrial build up in World War 2?
Most, if not all those countries listed, already had car manufacturers long before WW2.
In fact, a sampling of nation's car manufacturers and the year they were founded:
Not only that, but don't forget that France and the UK were/are producing car's still:
If anything, this is a great example of correlation not being causation - cars that now manufacture and export cars did not come about because they fought in WW2. Indeed, many of those nations listed had their industries destroyed by the war (mainly the Axis side) but they're now strong automotive producers.
Instead, a better narrative would be that the industrialized nations of the world primarily fought in WW2, and those nations by and large already had automotive industries before the war and continue to do so afterwards.
As for why there were no major Russian car manufacturers on the road today - the Cold War and their relative lack of participation in the world economy is also a huge factor
edit: formatting