With a quantity of three pieces, the Screw-pan-wsp-cros,6x is the most used part in the OIL TANK diagram.
Some items from this specific schematic: Tube-vinyl,5x280, Screw-pan-wsp-cros,6x, Clamp-fuel Pipe, Ring-o,20mm.
The lowest price component in this Oil Tank parts-list fiche is the Tube-vinyl,5x280.