Jamie Green put Audi top on Thursday as the DTM test at Barcelona's Circuit de Catalunya moved into its third day.
The Briton, who has jumped ship from Mercedes to Audi for 2013, posted a quickest lap of 1 minute 07.171 seconds and that was just enough to put ahead of the pack, 0.065 seconds up on his closest rival.
“A good day,” Green told the official DTM site. “We could complete our scheduled programme and executed every task we had on our list. That feels good. The track was dry, the sessions weren't temporarily red-flagged and we didn't encounter the slightest technical problems. We covered a lot of kilometres. In the afternoon session alone, we completed more than 100 laps. And doing so currently is of major importance, for me.
“There's just one thing that will help me getting the right feel for the Audi RS 5 DTM: as many laps as possible. The same applies to the collaboration with my race engineer and my data engineer – and the tests at Barcelona represented a good opportunity to improve this collaboration.
“The DRS wing also makes a positive impression. The effect won't be as big as in F1 and the overtaking won't be as easy as there but it will make overtaking easier, nevertheless.
“Today, we also learned a lot about the option tyres that are clearly faster than the standard tyres.”
Pascal Wehrlein meanwhile came in second for Mercedes, followed by Filipe Albuquerque, Roberto Merhi, Adrien Tambay and Christian Vietoris in positions 3 through to 6.
“Driving the DTM Mercedes AMG C-Coupe at Barcelona for the first time in an official test felt just great,” Wehrlein noted. “I really look forward now to continuing the work with the team and try to understand the car and familiarise myself with it as fast as possible.
“As things went rather well, today, I massively look forward to the tests tomorrow and to Hockenheim. For me as rookie it's crucial to learn as much as possible that will prove to be helpful in the season. I think we gathered a lot of data and findings today that will allows us to make a step forward.
“It goes without saying that having set the second fastest time feels great – but I'm aware that this is just a test and will keep my feet on the ground.”
Behind, Dirk Werner led the way for BMW in seventh, more than two tenths off the pace, with Mike Rockenfeller eighth in his Audi, ahead of the other BMWs of Andy Priaulx, Joey Hand and DTM rookie Marco Wittman.
Testing now concludes on Friday.