Marine Notes: What is A/E scraper ring function? / Why the lube oil levels of main engine sump tank suddenly drop down rapidly?

What is A/E scraper ring function? / Why the lube oil levels of main engine sump tank suddenly drop down rapidly?

Oil scraper ring is on the piston that scrapes the excess oil off the liner wall on the down stroke of the piston. This is done to remove excess oil from combustion chamber to enhance a uniform oil layer formation.