 As there is already an oil circulation system available for lubrication, this oil is also piped to the cylinder head and used as a liquid coolant.Compared to an oil system used solely for lubrication, oil cooling requires additional oil capacity, a greater flow rate through the oil pump, and an oil cooler (or a larger cooler than normal).If air-cooling proves sufficient for much of the running time (such as for an aero-engine in flight, or a motorcycle in motion), then oil cooling is an ideal way to cope with those times when extra cooling is needed (such as an aero-engine taxying before take-off, or a motorcycle in a city traffic jam).