We all know that oil is our common "Small Cooling Fan" lubricant, but, also took part in this oil grade. High, medium and low grades of oil. Low-grade oil, it is relatively thin, pour out like water may be just a little yellow color, but also volatile. Upscale "Small Cooling Fan" oil viscosity is better, not easily air to evaporate. Making it a longer life. The fan is a fan less lubricant Jia Duojia quality relationships. Oil adds a, "Small Cooling Fan" in the operation, it is possible to put the oil thrown out. Oil less of it, it will make the life of the fan will not reach 2W hours.