BMW M5 Wartungshandbuch PDF herunterladen (Seite 23)

Oil circuit lubrication

The S85 is equipped with a quasi-dry sump.

For this reason, a suction pump is used to

pump the oil out of the oil pan in the area

ahead of the rack and pinion power steering

gear into the rear oil sump. From here, a

controllable slide valve pump conveys the oil

at a max. pressure of 5 bar into the oil filter. A

thermostat that enables the path to the engine

cooler is additionally located in the oil filter

head. The oil is then routed from the oil filter

into the engine. Here it is divided over three

lines to the two cylinder heads and to the

crankcase. A special feature of this system are

the two electrically driven oil pumps that are

located on the left and right of the oil pan.

The electric oil pumps start up at a transverse

acceleration of 0.8 G and pump the oil from

the cylinder heads which, under these

centrifugal force conditions, would otherwise

no longer flow back into the oil pan.

The crankcase is ventilated by a cyclone

separator in the intake air manifold 6 - 10. The

return flow line from the oil separator and the

condensation return flow lines from the intake

air manifolds are routed along the 6 - 10 side

of the crankcase into the oil sump.

15 - S85 Oil circuit

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BMW M5 Wartungshandbuch Seite 23