Nismo Oil Catch Can / Separator to suit Nissan Skyline R33 GTR & R34 GTR - RB26DETT.

Blow-by gas exiting the combustion chamber can mix with engine oil and return during the intake stroke. While under normal condition oil collects in the intercooler, blowback can cause parts related to intake, such as the airflow meter, to become dirtied by oil. The NISMO oil separator separates the oil from the blowback gases returning from the cylinder head during the intake stroke, decreasing the amount of oil deposited in the intercooler. Because it is designed to return the separated oil to the oil pan, the oil separator also decreases motor oil consumption. The blowback gases are returned to the engine and are not released to the atmosphere, making this a valuable device for automobile inspection procedures.

*Unlike most catch can set-ups this returns oil to the sump.