Red Bull are set to rebrand their Renault engines as Infiniti engines for 2014 as part of the team's collaboration with the Renault-linked Nissan luxury brand.
"Next year, (Infiniti) is paying the Renault engine bill and wants advertising in return," said German magazine Auto Motor und Sport's correspondent Michael Schmidt on Friday.
As a result Schmidt says Renault are looking for a new partner to advertise with in F1, the favoured choice is Lotus which is the former Renault works team, although recent reports suggest Lotus is looking at changing engine suppliers for next season.
That is because of the high price tag Renault has put on its V6 turbo engines for next season, believed to be €20m+. Renault's competitors are offering much lower prices with Mercedes said to be the next highest at €15m.
Williams is considering a switch to Mercedes although back-of-the-grid Caterham did say they would continue with Renault for next season.
Lotus owner Gerard Lopez recently said his team was "not prepared to meet Renault's demands" when it comes to the high price tag.
Renault ambassador Alain Prost, who was in Monaco last weekend, defended the pricing strategy of the French carmaker.
"The budget of Renault Sport F1 is €150 million per year, and you can imagine that divided by four teams, for example, Renault is paying a big contribution," said the quadruple world champion.
Red Bull's second team Toro Rosso is also set for a switch to Renault engines next year with reports saying an announcement would be made in Monaco however, it is believed the deal is not quite done yet.
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