With both engines this was available from as low as 2500 rpm and remained constant up to 4800 rpm. (mercedes-benz.com)
At a low 1,700 rpm, the engine develops a maximum torque of 280 Nm, which stays constant up to 5,300 rpm — its torque curve has an ideal plateau and is actually not curved at all. (ausmotive.com)
But the chart on the right is not reality - the chart on the left is, which presents a fairly constant up / down of temperature change, essentially negating opposing extremes. (c3headlines.com)