The lack of power from the Renault engines in 2014 has led some to believe that Red Bull may be looking towards Mercedes, but they've denied these claims.
May 14 (GMM) Red Bull says it is not interested in being powered by Mercedes.
Things have now changed: McLaren is a mere Mercedes customer and switching to Honda, while Mercedes is totally dominating the 2014 season with its industry-leading new turbo V6.
Furthermore, Red Bull is less content than ever with struggling Renault, but Dr Helmut Marko on Wednesday played down suggestions the reigning world champions might want to be supplied by arch-rival Mercedes instead.
"We do not want their engine, even if it is the best," he told Germany's Auto Bild.
"How would we ever know that they are giving us equal equipment?" Marko added.
Red Bull mogul Dietrich Mateschitz told Speed Week: "First, we have a long-term contract with Renault.
"And secondly, we would only receive a customer engine from Honda."