| 摘要 |
An oil changing device includes a used oil tank connected with an air suction device which is connected with a compressor and a vacuum generating device. A switch is connected between the vacuum generating device and the compressor. A new oil tank includes a pipe connected to a mechanical item whose oil is to be changed and another pipe connected to a connector of the used oil tank. The compressor and the vacuum generating device suck air in the mechanical item so as to form a negative pressure status to suck the used oil from the mechanical item into the used oil tank. The new oil in the new oil tank is then sucked into the mechanical item via another pipe controlled by another switch.
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