Red Bull Racing could yet bill Renault for lost revenue such is the F1 team's unhappiness over the French manufacturer's issues.
Red Bull's latest title defense has been blighted by problems with their new Renault 1.6-litre turbocharged V6 engines.
Sebastian Vettel seems to have suffered the bulk of the issues with the German's most recent trials coming in Monaco where he was forced into retirement due to a turbo failure.
At the time a frustrated Christian Horner said "It is a Renault issue so I think you need to speak to Renault about that reason."
However, it won't just be journalists speaking with the French manufacturer as Helmut Marko says their accounts department will also be having a little chat at the end of this season.
The Red Bull advisor has revealed that Red Bull could bill Renault for lost revenue as the engine supplier is costing them valuable points and positions in the Constructors' Championship.
"It would be irresponsible to talk about the exact figure at the moment," he told Germany's Bild.
"But the list of losses due to problems with the Renault engine is long enough.
"The season is not yet finished but at the end of the Championship our finance department will assess the damage.
"That's when we can talk about the magnitude of losses due to Renault problems."
Meanwhile, Vettel says he is worried about running out of engines before the season is over.
This year drivers are limited to just five power units before they start to incur penalties. Vettel has already had three turbo issues.
"You can easily calculate that will not be enough," the four-times Champion told Auto Motor und Sport.
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