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