"It was ⁠just nice to be back, nice to see a number one on my car, pretty cool and pretty surreal still. It's a good feeling," said the 26-year-old after lapping in cold temperatures at the Spanish Grand Prix track on Wednesday (local time). "It's literally not been built until this morning ... nice ‌to see it ​all come together. "Today was really just a first understanding of the whole car, understanding just how it works really, going through the manual." Audi, the former Sauber team now using ‍their own engine, also lost time in the morning with a technical issue.