Question: What engine is in the audi r8 v10?
Disambiguated questions and answers: question: What engine is in the Audi R8 (Type 42)?
What engine is in the Audi R8  (Type 4S)?
answer: 4.2 L FSI DOHC V8 5.2 L odd firing FSI DOHC V10
5.2 L FSI V10
Natural Questions answer: V10 FSI (from the Wikipedia article "Audi R8")