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