Such microstructure qualities are particularly important for the high sliding speeds on the gearing and on the bearing journals which occur in {HEAD ~ operation}, in particular in the case of the simultaneous occurrence of high temperatures and low viscosity values of the oils used in {TAIL ~ the engine} 
Such microstructure qualities are particularly important for the high sliding speeds on the gearing and on the bearing journals which occur in { HEAD ~ operation } , in particular in the case of the simultaneous occurrence of high temperatures and low viscosity values of the oils used in { TAIL ~ the engine }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL