Yes, you read that title correctly. The V10 engine in the engine bay of the S6 is similar to that in the Gallardo. Since both brands are owned by Volkswagen Group, it's not uncommon to see parts and performance sharing. How cool does it sound when telling people there's a Lamborghini engine under the hood? The S6's V10 has a larger displacement, making it adaptable to the larger and heavier sedan.
Just when you thought this sedan couldn't be more impressive, a redesign is expected shortly. It'll be very interesting to see what Audi plans considering the competition in this market is heating up.