Niki Lauda has denied rumours that Mercedes might provide engines for Red Bull once their current contract with Renault ends in 2016. Speculation is rife Red Bull could run with Mercedes engines rebranded as Aston Martin. Mercedes currently hold a 5% stake in the prestigious British car manufacturer.  Lauda, non-executive chairman at Mercedes, told Reuters that the rumours were 'a load of rubbish.'  'We have not been asked, we never thought about it. That's it,' he added.  Motorsport boss at Mercedes, Toto Wolff, would not completely discounting the likelihood of an engine deal with Red Bull happening in the future, however.  Speaking to Autosport, Wolff...
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