Other manufacturers (e.g. BMW -- pretty sure the same is true for Audi) do not have the same issue; in fact, the original report is very clear on that matter: t

Other manufacturers (e.g. BMW -- pretty sure the same is true for Audi) do not have the same issue; in fact, the original report is very clear on that matter: the issue is specific to VW. The reason is that other manufacturers rely on injecting a pollution-neutralizing compound at exhaust time (there is a separate tank for that stuff), whereas VW claimed that they have been able to design engines that do not require this (obviously costly and undesirable) step, and are clean all by themselves.