Mercedes boss Toto Wolff says his DTM squad are fully aware that their Norisring success will not count for much at this weekend's Russian round at the Moscow Raceway.

Mercedes, amazingly, have won two of the four races on offer so far this season thanks to victories from Christian Vietoris and Robert Wickens, who both brilliantly tamed the chaotic wet conditions at Oschersleben and the Norisring.

But Wolff admits their C-Coupe machine still remains off the pace under normal-dry circumstances in comparison to their BMW and Audi championship rivals.

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"The successful weekend at the Norisring was a real tonic for our team," said Wolff. "Robert's race win was a just reward for the tireless effort that everyone in the team has put in since the start of the season. Even so, the task that awaits us in Moscow will not be an easy one."

"We know that we still have to raise our performance on this type of track, and we will continue to work hard on making improvements."

Wickens, who along with Vietoris sits as Mercedes' current DTM top scorer, echoes Wolff's realistic approach to this weekend's Russian round and admits coming to Moscow on the back of a race victory wasn't what he expected at the start of the year given the problems his team have endured.

"I certainly wasn't expecting to be coming to Moscow on the back of a race win," said Wickens.

"But that's motorsport for you - it's just full of surprises. Despite that victory at the Norisring, we have to be realistic.

"As a racer, I'm obviously looking to win all the time, but under normal conditions and with this being a permanent track, we are still looking for improvements."