Genuine Nissan Oil Pickup O-Ring

Suits: GU Patrol with ZD30Di (Direct Injection) & ZD30Cr (Common Rail) Motors.
This is the O-Ring located on the oil pickup on the engine block, not the figure 8 o-ring between the engine block and the sump.

It is common for these seals to go hard and crusty over time, this can cause low oil pressure.