DTM rookie Nico Muller was quickest on the second day of pre-season testing at the Hungaroring circuit on Tuesday.
The Team Rosberg driver produced a lap of 1m37.505s during the afternoon and bettered Miguel Molina's first day best time of 1m37.792s to give Audi its second consecutive top position on the timesheets.
"This was a great first day at Audi and in DTM," said Muller.
"We don't really mind the times but nonetheless, it's always nicer to be at the top of the timesheets than further down."
The 21-year-old finished the day 0.410 seconds ahead of fellow Audi driver Mattias Ekstrom, with Mercedes' Gary Paffett completing the trio of drivers to dip beneath the 1m38s barrier.
Series returnee Paul di Resta was fourth quickest and the Scotsman was followed by four BMW M4 drivers, the quickest of which was Marco Wittmann.
"We succeeded in completing our scheduled programme and gathered some valuable experiences," said the RMG driver.
"We don't try to set the fastest lap times, but want to reel off our programme and gather as much information as possible, and so far it has been a very positive test."
DTM debutant Antonio Felix da Costa - who set the pace in the morning - Joey Hand and Bruno Spengler completed the BMW quartet occupying positions fifth to eighth.
Former Formula 1 driver Vitaly Petrov claimed ninth, ahead of the Audis of Edoardo Mortara and Timo Scheider.
Pos Driver Team/Car Time Gap 1. Nico Muller Rosberg Audi 1m37.505s 2. Mattias Ekstrom Abt Audi 1m37.912s +0.407s 3. Gary Paffett HWA Mercedes 1m37.927s +0.422s 4. Paul di Resta HWA Mercedes 1m38.121s +0.616s 5. Marco Wittmann RMG BMW 1m38.160s +0.655s 6. Antonio Felix da Costa MTEK BMW 1m38.168s +0.663s 7. Joey Hand RBM BMW 1m38.286s +0.781s 8. Bruno Spengler Schnitzer BMW 1m38.458s +0.953s 9. Vitaly Petrov HWA Mercedes 1m38.781s +1.276s 10. Edoardo Mortara Abt Audi 1m38.786s +1.281s 11. Timo Scheider Phoenix Audi 1m39.054s +1.549s 12. Pascal Wehrlein HWA Mercedes 1m39.826s +2.321s