Depends on the car; Some use plastic, others fiberglass, still others use sheet metal (aluminum or steel).
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In the past (quite a long time ago!) most car manufacturers actually made all the parts that went into the car, so they bought metal, plastic, wood, etc, and then made parts out of these materials, then made a car with the parts they had made. These days most car companies buy parts made by other companies, and then "assemble" the parts into a car. So they no longer "manufacture" a car, they "assemble" it.
Many parts of a car are made of steel due to its strength and durability. Key components include the car's frame, body panels, and structural reinforcements. Additionally, various engine components, such as the crankshaft and transmission housing, are often made of steel. Steel is also commonly used in suspension parts, brakes, and certain fasteners.
Nearly All American car parts are made in China, especially Ford.
For the most part the entire body is made of steel. Some cars have aluminum hoods, trunk lids, and even fenders. There have been cars where the entire body was aluminum or carbon fiber. Some engine parts are steel, wheels may be steel, and other parts in the car are made of steel.
body-made
The car engine radiator.
It depends on the car, but mainly drivetrain parts(motor, accessories, transmission) suspension, rims and sometimes body panels, frames, interior trim.
ontario
the muffler
the mufler
Engine blocks are made out of aluminum to increase the miles per gallon. Car parts of made of steel and alumnium, and also of plastic.