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