Valtteri Bottas says Mercedes should be more open to giving customer teams the latest specification power units as he believes it would mutually beneficial for both parties by making Williams more competitive against closest rivals Ferrari.

The Finnish driver has reaffirmed his faith in the Mercedes hybrid power unit as the strongest on the F1 grid and felt he had an almost certain podium stolen from him after being clipped into a spin on the final lap of the Russian Grand Prix by Kimi Raikkonen.

Despite Mercedes wrapping up the constructors' champion because of the Bottas-Raikkonen clash - the Ferrari driver was handed a 30-second post-race time penalty, dropping him to eighth and swaying the points totals in Mercedes' favour - the Williams driver says he would have been better able to assist the German manufacturers' title charge with the latest specification engine.

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"I don't know the reasons why the customer teams didn't get the latest spec from Mercedes but I'm sure there's some thinking behind it," Bottas said. "If Mercedes thought it would be better for us to have the latest spec, I'm sure they'd have handed it to us because it would help us challenge Ferrari and that would ultimately help Mercedes too.

"I trust they're doing what they think it's best for us, so I'm not disappointed by this decision. We are very happy to have Mercedes power units, they're still the best out there and with this new unit we can be competitive."

With news recently surfacing that the FIA is set to change the technical regulations to ensure customer teams receive the same engines as factory teams, Bottas may get his wish next season, subject to discussion at the next F1 Commission meeting.