I also wanna know why avoid. Does this have the very expensive to replace run flat tyre also?

I haven't have friend or heard anything about this blue tec thing. Maybe few years ago la in /K that says the car battery expensive. But is that the only concern? Its the same like Prius battery is expensive. But what other problems is there? At least we know now Prius is reliable as a regular corolla besides the expensive battery. But what about bluetec Mercs?

I just browse that page for a while, like every post seems to talk about problems and accesories.