In the heyday of Detroit, popular cars like a 57 Chevy included a die cast aluminum alloy automatic transmissions. Success leads to wide spead adoption. The aluminum alloy used to make the automatic transmission became the world standard. Die cast aluminum alloy became a commodity listed on the London Metal exchange. The purchasers of 57 Chevy .autos enjoyed the advancement. This is similar to the improvement in human lives that became possible with the creation of metal alloys for making a surgical scalpel. Time marches on. Today, we would not consider using anything but a scalpel made of the best surgical steel alloy. The buying public feel the same way about thier automobiles. The enthusiasic public acceptance of electric automobiles are causing new aluminum die cast alloys to displace the old standards. The brittle corrosion prone old standards are being replaced with ductile aluminum die cast alloys that are strong without heat treat.