jodo, por eso, meterle al A 4 un poderoso TDI de 323 cv´s, y adecuarlo tipo serie RS, con el motor 4.2 V 8 del A 8 Audi is considering producing its first diesel-engined RS performance model. A new 4.2-litre V8 diesel engine, developed for the flagship A8 saloon, has been engineered so that it fits smaller Audis. The company has confirmed that the 323bhp V8 will fit into the engine bay of the A4. The petrol-powered RS4, with a 414bhp 4.2-litre V8 engine, is due to arrive towards the end of this year. It sprints to 62mph from rest in 4.8sec and has a limited top speed of 155mph. A diesel-engined RS4, although less powerful, ought to come close to matching those figures. Thanks to its superior pulling strength, it would probably pick up speed quicker than the petrol car on the move, too. The 4.2-litre diesel engine gives the A8 a claimed 0-62mph time of 5.9sec, so a smaller and lighter RS4 would likely undercut that. The diesel RS4 has not been confirmed for production, but Audi sources said it would be ‘a logical thing to do’.