My parents' friends have a 540i m-sport and last weekend I noticed some strange tire wear. the outer edges of the front tires are totally worn. i dont understand why that would be. while she is taking it in tomorrow, I still wanted to know what could cause such wear. anyone know?

It needs an alignment...

That it?

yup sounds about right! same use to happen to me before i got an alighnment, all fixed now. :D