{HEAD ~ Diesel fuel combustion systems} are being engineered to incorporate {TAIL ~ one or more new components} which may result in the accumulation of new, high mass levels of soot loading in engine lubricating oils 
are engineered to incorporate
{ HEAD ~ Diesel fuel combustion systems } are being engineered to incorporate { TAIL ~ one or more new components } which may result in the accumulation of new , high mass levels of soot loading in engine lubricating oils
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