The choice of automotive operating systems can vary among different automotive companies, and they may use different operating systems for various purposes within their vehicles. As of my last knowledge update in January 2022, here are some examples of automotive operating systems used by prominent automotive companies:

1. Tesla:
   • Tesla uses its own proprietary operating system, known as Tesla OS. It is a highly customized operating system based on a Linux kernel and is designed to support the unique features of Tesla vehicles, including Autopilot and other advanced driver-assistance systems.
2. General Motors (GM):
   • GM has used the QNX operating system in some of its vehicles for infotainment systems. QNX is a real-time operating system known for its reliability and has been widely adopted in the automotive industry.
3. Ford:
   • Ford has used various operating systems over the years. In some of its vehicles, especially earlier models, Microsoft’s Windows Embedded Automotive was utilized. In recent years, Ford has developed its own SYNC infotainment system.
4. Toyota:
   • Toyota has employed a variety of operating systems in its vehicles. Some models may use Linux-based systems, while others may utilize proprietary systems developed by Toyota.
5. Honda:
   • Honda, similar to Toyota, has used a mix of operating systems in its vehicles. Linux-based systems have been reported in some models, and Honda may also use its own developed software.
6. Volkswagen Group (including Audi, VW, Porsche):
   • Different brands under the Volkswagen Group may have different approaches. Generally, they often use proprietary systems based on AUTOSAR standards. Some may use Linux-based solutions for specific applications.
7. BMW:
   • BMW typically uses its proprietary operating systems based on AUTOSAR standards. They may have different variations for various vehicle systems.
8. Mercedes-Benz:
   • Mercedes-Benz often employs proprietary operating systems based on AUTOSAR standards. Their systems are designed to integrate various in-car functions seamlessly.
9. Hyundai Group (including Hyundai, Kia):
   • Hyundai and Kia have used a mix of operating systems. Some models may utilize Linux-based solutions, while others may rely on their own developed systems.

It’s important to note that automotive companies may use different operating systems for different purposes within a vehicle. For instance, they may have one system for infotainment, another for the engine control unit, and so on. Additionally, the information provided is based on the state of the industry as of early 2022, and there may have been changes or updates since then. For the most current information, it’s recommended to check the official announcements or documentation from the respective automotive companies.