Abstract: This invention relates to novel secondary diamine compounds which can be represented by the general formula:R.sup.1 (R.sup.2)HCHN-A-NHCH(R.sup.2)R.sup.1wherein R.sup.1 and R.sup.2 are the same or different substituent comprising C.sub.n H.sub.2n+1 wherein n=1 to 6, and A is a branched-chain divalent saturated aliphatic radical containing 4 to 7 carbon atoms, particularly 1,5-diisopropyl-amino-2-methylpentane. It relates also to compositions containing said compounds which are useful for stabilizing hydrocarbon distillate fuel oils, hydrocarbon distillate fuel oils stabilized therewith, and to processes for stabilizing such oils.

Abstract: Two component fuel additive compositions comprising a hydrocarbon-soluble, acylated, poly(alkyleneamine) and from 1 to 10 parts per part of said poly(alkyleneamine) of a normally liquid, hydrocarbon-soluble polymer of a C.sub.2 to C.sub.6 monoolefin or diolefin; also a concentrated hydrocarbon solution of said additive and a fuel composition containing an amount of said additive effective to provide carburetor detergency in spark-ignition engines.