Red Bull's motorsport adviser Dr Helmut Marko believes the bad blood between Mark Webber and Sebastian Vettel dates all the way back to 2007.
This year tensions between the pair reached an all-time high following the 'multi-21' incident at the Malaysian Grand Prix where Vettel ignored a team order to stay behind his Australian team-mate and overtook him to take the victory.
After the race Vettel said the action was payback for Webber not helping him at last season's finale in Brazil and also believed the Australian "did not deserve to win".
However that was far from the opening chapter between the pair. "It goes back to Fuji 2007", said Marko.
Indeed in the Japanese race six years ago Vettel, then a rookie at Toro Rosso, and Webber, driving for Red Bull, were running second and third in the very wet conditions.
Under the safety car Vettel took out Webber running into the back of the Australian after being unsighted in the spray.
A furious Webber famously slammed "kids" who "f*** it all up".
"He (Vettel) probably cost him (Webber) his first victory," said Marko. "Since then there was trouble."
There have been various moments between the pair in the five years they have been team-mates at Red Bull coming to a head in Malaysia this year, and when Vettel and the rest of the Red Bull team gathered for the post-race photo in India after capturing both titles, Webber was not there.
"Well done to Seb on his championship," Webber said in a post-race statement after retiring with alternator failure.
And also to all the team; to get a fourth title is amazing."
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