{TAIL ~ The railway diesel crankcase lubricant composition} 1, wherein said pentamethylenehexaamine is substituted with a N alkyl alkylene diamine having the formula ##STR13## wherein R is hydrogen or a hydrocarbon group and R3, R4, and R5 {HEAD ~ each} are hydrogen or a hydrocarbon group, and a is an integer between 0 and 7 
{ TAIL ~ The railway diesel crankcase lubricant composition } 1 , wherein said pentamethylenehexaamine is substituted with a N alkyl alkylene diamine having the formula # # STR13 # # wherein R is hydrogen or a hydrocarbon group and R3 , R4 , and R5 { HEAD ~ each } are hydrogen or a hydrocarbon group , and a is an integer between 0 and 7
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