Technical data

13
8
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