Some items from this specific schematic: Screw, Flat Fillister(22f), Gasket, Pump Cover (nas), Pin, Dowel, Strainer 2.
The component with the lowest price in the OIL PUMP schematic is the Pin, Dowel(4jt).
With a quantity of two pieces, the Pin, Dowel is the most used part in the OIL PUMP diagram.