The advantages of aluminum alloy auto parts over steel parts outweigh its disadvantages. More and more manufacturers are experimenting with relatively expensive aluminum die-castings because it is lighter than steel. It makes the car leaner and faster. It also helps achieve fuel efficiency standards – since lighter vehicle means less fuel used. So the expensive material makes up for the cheaper fuel consumption of the car in the long run. There are several luxury models that are made with aluminum car frames. This is in fact a few times more expensive than steel cars but the user will be ensured that it would help save energy. Environmental advocates will love it more because it is almost a hundred percent recyclable – another standard that aluminum helps achieve.