What does oil churning loss mean?

[DeTeagan]

Oil churning loss refers to the power loss due to oil churning, also known as no-load loss or idle power loss. The extent of oil churning loss varies depending on the lubrication method, and within different lubrication methods, it also differs due to various factors. Impact of oil temperature on churning loss: Before significant changes in lubricant viscosity occur, oil temperature has the greatest influence on transmission oil churning power loss, followed by rotational speed, with oil volume having a relatively minor effect. When oil volume is constant, at low speeds (below 1000 rpm), power loss shows a linear relationship with both oil temperature and rotational speed, and the power loss is relatively small. At high speeds, the power loss does not exhibit a linear relationship with oil temperature and rotational speed. Impact of oil volume on churning loss: When lubricant temperature is constant, at low speeds (below 1000 rpm), power loss has a linear relationship with oil volume. At high speeds, this relationship is not linear. With constant lubricant temperature, power loss generally shows a linear relationship with rotational speed (though when the transmission is in neutral, the best-fit curve is not a simple linear one).