When it comes to big displacement, the Volkswagen Group has two examples of what it means to go over the board in terms of internal combustion. The 5.2-liter V10 found in the Audi R8 and Lamborghini Huracan is one of those big engines, but the title of king of the hill goes to the 6.0-liter W12 in the Bentley Continental GT and Bentayga. Regrettably, both might be gone in a few years.