The lubricating oil finds its way into {HEAD ~ the path} of {TAIL ~ the coolant} and becomes mixed therewith 
The lubricating oil finds its way into { HEAD ~ the path } of { TAIL ~ the coolant } and becomes mixed therewith
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH