Audi's DTM boss Dieter Gass believes his RS 5 squad let the 2015 manufacturers' championship slip through their fingers despite dominating both races at the Hockenheim season finale.

Victories from Timo Scheider and Jamie Green during the Hockenheim weekend ensured the RS 5 machine won over half of the races on offer this season but it still wasn't enough to deny BMW the manufacturers' crown by just seven points.

"This was a bitter-sweet ending of the season for us," said Audi's Head of DTM, Gass.

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"The fans got to see an impressive performance of the Audi RS 5 DTM and a superb one-two-three win once more."

Audi's defeat will come particularly as a bitter blow after the Ingolstadt manufacturer was stripped of 62-points earlier in the season as part of their punishment over the 'push him out' scandal.

However, a further series of incidents during the final race cost Audi the chance of scoring extra points while the title was still lying on a knife-edge.

Miguel Molina and Nico Muller both dropped out of the points after receiving drive-through penalties for separate incidents while Adrien Tambay was knocked out of the race due to the contact between Molina and Christian Vietoris.

Molina and Vietoris' collision sent the Spaniard's Team Abt RS 5 into side of Tambay, which forced the Frenchman into an retirement when battling for the podium.

"In spite of a difficult starting base, the manufacturers' title was within our reach today, but we let it slip away. It was aggravating that we incurred two drive-through penalties."