However, the oil cooler needs a higher cooling power than a comparable piston engine's cooler. For rotor lubrication, the engine is fitted with a small nutating-disc oil-metering pump that provides 6−1 mm3 of oil per rotor and engine output shaft rotation. It is driven by the eccentric shaft, and has a reduction in the range of 1:45 until 1:60. The pump's main variation of volumetric flow rate is controlled by the gas pedal linkage, but the pump also allows the aforementioned range in reduction, as well as a reduction in pumping stroke to adapt to several engine conditions. It is tuned to provide an oil film on the housing with a thickness of 30 nm. Due to the engine's petrol direct injection, the oil cannot be injected through the fuel injector, because that would result in mixture formation and eventually combustion. Therefore, the oil is introduced into the throttle valve bushing near the intake port, from where it enters into the engine's chambers. Technical specifications Power diagram of the M 950/4 References M 950 M 950