What is the difference between the Audi A8 55 and 60 models?

I'm looking to purchase an Audi A8 and am confused about the differences between the 55 and 60 models. Can anyone explain the main distinctions between these two options?

The main difference between the Audi A8 55 and 60 models is the size and power of the engine. The A8 55 comes with a 3.0-liter V6 engine, while the A8 60 has a 4.0-liter V8 engine. The A8 60 also has a higher horsepower and torque output, making it more suitable for those who want a more powerful driving experience.