MotorTrend believes the N57 diesel is BMW's best 6 cylinder
seems to have a thing for for BMW diesels namely the 535d they recently drove. And why not? Great car, good power, nice mileage, the all around package. Calling it BMW's best 6 though? We do not agree. They are basing this on the N55 6 cylinder not being smooth to drive vs. the diesel which maybe the problem is them. It isn't BMW's best 6, it isn't better than the N54 or N55, but it certainly is a nice motor worthy of respect.