Originally posted by likaciv
Its a pressurized oiling system, incase under hard cornering the oil sump is not submerged in oil, it takes it from a presurized oil tank, which takes over the duties of the sump, it allows for a shallower oil pan. I think, its somewhere close along those lines.
Not quite correct but going the right way. In a dry sump system oil is stored in a remote tank. Oil is scavenged out of the engine sump by 2 or more pumps and sent to the remote tank. Oil from the tank is then fed to a pressure pump for engine oiling.
Dry sump oil pans are much shallower than wet sumps (better ground clearance). Oil pressure is maintained during extreme cornering. Less windage losses and oil whipping at high RPM.
Down side is it's a more complex and expensive system. Also many more points for oil leaks to occur.