The invention includes methods of collecting crude oil and apparatus which collect crude oil. In one implementation, a crude oil collection header apparatus includes a collection reservoir and a plurality of fluid conduits connected to feed crude oil to the collection reservoir. The fluid conduits respectively include a collection reservoir feed valve, a bypass valve, and a crude oil feed inlet received between the collection reservoir feed and bypass valves. A bypass conduit to which the fluid conduits connect is received downstream of the respective bypass valves. The bypass conduit includes a gas separator device. A flow meter conduit is connected with the bypass conduit downstream of the gas separator device. A flow meter is operably connected with the flow meter conduit. A crude oil outlet is associated with the collection reservoir. Other aspects and implementations are disclosed.