Engine Oil System: Notes

The oil supply system of the S62B50 engine is specifically designed for the M5 and Z8. Due to the sport nature and the ability for high speed cornering (transverse acceleration) of up to 1.2g, the engine oil could be forced (and trapped) into the outer edge of the cylinder head and the rear area of the oil sump.

The main oil pump function is to supply the engine with the required volume of oil for all of the lubrication needs.

To prevent oil starvation from occurring during these driving situations, two additional scavenging oil pumps are installed within the main oil pump housing (integral unit).

The two additional pumps only supply the oil sump with the scavenged oil.

Each additional oil pump incorporates a solenoid changeover valve  that is connected to two scavenging tubes routed to the rear section of the oil pan and the outer edge of the cylinder head.

The scavenging tubes in the oil pan crossover so that the right side pump draws from the rear left side of the pan and the left pump from the right side of the pan.

The solenoid changeover valves must be removed before attempting to remove the oil pan. The valves insert directly into the scavenge pump housing through the oil pan.

The upper oil pan for the Z8 is been modified  due to the engine and crossmember "clearance" relationship.

The upper oil pan is contoured around the oil pump drive at the front of the engine (arrow).