What type of brake fluid should I use for my Audi R8?

I recently purchased an Audi R8 and am not sure what type of brake fluid to use. The owner's manual recommends DOT 4, but some forums say DOT 5.1 is better. Which one should I use?

As a car mechanic, I would recommend using DOT 4 brake fluid for your Audi R8. It is the most commonly used type for high-performance vehicles and meets the manufacturer's specifications.

I have been using DOT 5.1 brake fluid in my Audi R8 for years and have had no issues. Just make sure to properly flush and bleed the system when changing to a different type of fluid.