None of the car manufacturers can show anywhere close to emissions testing performance in real-world tests: https://youtu.be/7t4paclIwuU?t=13m15s https://youtu

None of the car manufacturers can show anywhere close to emissions testing performance in real-world tests: https://youtu.be/7t4paclIwuU?t=13m15s https://youtu.be/7t4paclIwuU?t=13m15s And for GM, the linked video already shows Opel installed defeat devices, which is a daughter brand. So it's just natural that the same "technology" shows up in other GM cars.