回複：汽車換機油為什麽不在引擎底下旁邊裝個水龍頭，手伸去打開就可以了，為什麽非得把車子架起來，用大起子擰大羅絲？

還真有這麽個閥門， called "oil drain valve"

http://www.amazon.com/dp/B003VCELCW/ref=asc_df_B003VCELCW2034275?smid=ATVPDKIKX0DER&tag=hyprod-20&linkCode=asn&creative=395093&creativeASIN=B003VCELCW&hvpos=1o1&hvexid=&hvnetw=g&hvrand=10010594052021047772&hvpone=&hvptwo=&hvqmt=