Lewis Hamilton's Mercedes team have dismissed the need for change despite costing their star driver victory in a dramatic Austrian Grand Prix.
Hamilton will head into his home race at Silverstone next Sunday one point behind Sebastian Vettel after the Brit failed to finish following a mechanical failure.
A scathing Hamilton had already accused Mercedes of costing him a straightforward win after, and not for the first time this season, they failed to react to a Virtual Safety Car (VSC) period, caused by Valtteri Bottas' retirement in the sister car, and stop him for new tyres.
Toto WOlff admitted he had suffered his worst day while in charge of the Mercedes team
Hamilton dropped to fourth, and following a series of furious exchanges with the Mercedes pit wall, he then ran out of power with only seven laps remaining.
Having led a one-two after the opening lap, Mercedes eventually saw both their cars retire on a day where Hamilton and Mercedes both lost their world championship leads.
'It is a tremendously painful day for us, Toto Wolff told Sky Sports. 'For me, personally the most painful in the last six years, that's with Barcelona  losing both cars. We were one-two on the grid, good fantastic first lap. The VSC doesn't go more cruel for us.
Lewis Hamilton was forced to retire from the Austrian Grand Prix while running in fifth place
The Brit's retirement came following a dismal afternoon that saw him lose the title lead
'We have to come back strong and the difficult days are the ones where you learn the most but you have to stay positive.'
Red Bull driver Max Verstappen capitalised on Mercedes' first double mechanical DNF since their return to the sport in 2010 to claim his fourth career win ahead of Kimi Raikkonen and Vettel.
Hamilton's retirement, his first in 33 races, ensured a 15-point championship swing in Vettel's favour.
Mercedes have dominated the sport since 2014, but they are crumbling under the fiercer competition provided by both Ferrari and Red Bull this year.
Mercedes has already seen the retirement of Valtteri Bottas early on in the race
Here, distracted by Bottas stopping on track