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