回复：汽车换机油为什么不在引擎底下旁边装个水龙头，手伸去打开就可以了，为什么非得把车子架起来，用大起子拧大罗丝？

还真有这么个阀门， 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=