Alpina D4 Biturbo driven - is this the world’s best performance diesel?

Subscribe to the channel now: The D4 Biturbo is Alpina’s follow up to the stunning D3. It’s capable of reaching 60mph in 4.6 seconds and can return up to 53mpg. Sounds like the perfect package, then, but are there any drawbacks? Steve Sutcliffe finds out. Autocar, the world’s leading motoring magazine and website, delivers industry-leading news, the most in-depth car reviews and opinion from our team of experts. Our presenters include some of the world’s top motoring journalists