If you ever wondered what a 190E 2.3-16 was/is all about the owner provides you with a brief description. If you remember Ayrton Senna made his mark in Europe, and was noticed driving one of these cars.
Yes its a Cosworth head from back in the day when Cosworth was the undisputed leader in designing cross flow heads with 4 valves per cylinder. Look at the shift pattern on the transmission set up to keep the engine revving especially on a track.
Were they good cars? A high revving 4 cylinder Benz back in the day had limited appeal to a customer base more attuned to V8's. You can quickly conclude that a high revving engine would have some oil consumption which was the case with the "16 valver".