means for directing said {HEAD ~ intermingled oil} and {TAIL ~ coolant} back to said coolant tank 
means for directing said { HEAD ~ intermingled oil } and { TAIL ~ coolant } back to said coolant tank
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH