I’m so old I remember when the only significant quantity of magnesium in an automobile might have been a set of aftermarket wheels. That’s not the case now. More and more parts on cars and trucks, including large body parts, are aluminum, and many aluminum alloys contain magnesium. There’s a lot of magnesium in a modern vehicle.
China produces over 80 % of the world’s magnesium. Recent power shortages have severely affected the region where most of China’s production is based, so a magnesium shortage is expected to hit vehicle manufacturers before the end of 2021.