Thus, the oil filling device may accommodate various heights and angles of oil filling hole of engine and allows filling of oil into {HEAD ~ the engine} to be conducted in {TAIL ~ a smoother manner} 
to be conducted in
Thus , the oil filling device may accommodate various heights and angles of oil filling hole of engine and allows filling of oil into { HEAD ~ the engine } to be conducted in { TAIL ~ a smoother manner }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL