![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj3uEmDC6wG0sJ6swnHLGD0frOmVbN0cTKWIJz3Q6eL9arrC5Cn_iS2EooCvZL6wtcirM_zijYtj3FD-Z0cu8XDYS1Ry4JlOclqL1SKgYq1GO6uG25OWXib7TCV5Qq8FW-7IKT0iTojIzJe/s200/Picture+1.png)
Imagine, then, the dilemma faced by the folks at Mercedes Benz when they chose a sub-branding theme for its new line of biodiesels. Mercedes BlueTEC involves a substance called AdBlue. AdBlue is urea. Here's a case where the plain simple English rule would not have worked well. Who wants to drive the urine-powered E Class?