The current partnership between Mercedes and McLaren on the SLR has come to an end, and like all ugly divorces, things are getting a little tense. The next McLaren supercar (internally know as the P11) will not receive a Mercedes engine. Mercedes, who owns a piece of the supercar firm is upset at the thought of supporting a car with a rival's engine. Now Mercedes is threatening to cease its financial backing of McLaren, according to a report by Germany’s Auto Motor und Sport.

Initial rumors said the future McLaren supercar will be powered by a 6.3-liter V8 making 550 hp, but now, if another supplier will not be found soon the car could see some significant delays.

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