BMW and Audi trolling one another

BMW and Audi have some history when it comes to banter (or trolling, if you prefer) one another. They were at it again this week when BMW posted a shot of an M4 with a few distinctive rings in the background...

Despite a tweet saying they couldn't wait for BMW's response, at the time of writing Audi has yet to respond to BMW's retort below. Watch this space. (Great choice on car and colour though.)

Of course it's not the first time the two German firms have gone head to head. The one below went back and forth a few times.