They didn't build cars during the war, so when WW2 ended, everyone needed a new car..The big technological advance was the electric turn signal. Now you could signal a turn even in the winter when the windows were up. Chrysler started using electric windshield wipers right after the war ended, but Ford and GM stayed with the old vacuum operated wipers until the mid 50s. If you floored the gas going up a hill, the wipers would stop. Very exciting to see if you could get up the hill without being able to see. There was no button to wash the windshield, but we had a better system. You could pull into any gas station and run over the little black hose. A bell would ring and the attendant would run out and wash your windshield and check your oil level. All of this was free in the hopes that you would buy a dollar's worth of their 25 cent per gallon gas. Check your tire pressure free too? Sure, this was a “service” station. Pump your own gas? What? You are kidding.
Tires were reinforced with cotton cords. If you hit a big pothole, you probably got a blowout. By 1950 they switched to nylon cords, and the tires lasted much longer. Tubeless tires came in about then too. This created a whole new industry of making float toys to take to the beach.
Motor oil in those days had a curious habit of turning to a jelly like substance after a couple of thousand miles. You were supposed to change it every thousand miles while it would still run out. It came in real metal cans and cost less than 20 cents per quart. You didn't need to worry about it clogging the oil filter because most cars didn't have one.