Abstract: Polymer blends suitable as flow improvers for crude oils, comprising a polymer having a plurality of linear paraffinic C.sub.18.sub.+ side chains, and a copolymer of ethylene and an ethylenically unsaturated compound having no such side chains.

Abstract: This invention relates to gasoline compositions containing additives which are reaction products of a maleic anhydride of the formula ##EQU1## with a linear polyamine of the formulaH.sub.2 N--(CH.sub.2).sub.n -- NH].sub.m R'in which R.sub.1 and R.sub.2 are selected from the group consisting of a hydrogen atom and a monovalent hydrocarbon radical of 1 - 30 carbon atoms, R' is a monovalent aliphatic hydrocarbon radical having 6 - 30 carbon atoms, n is an integer from 3 to 10 and m is an integer from 1 to 10.

Abstract: Secondary amines having two straight chain aliphatic hydrocarbon groups of 8 to 30 carbon atoms each are wax crystal modifiers for middle distillate fuel oils and can be used in combination with polymeric pour point depressants and an amorphous petrolatum, to lower the pour point and/or improve cold flow properties of the oil.

Abstract: Gasoline compositions containing cyclopentadienyl manganese tricarbonyl antiknock and a glyceride ester in an amount sufficient to alleviate the plugging of catalysts being used in an engine exhaust system to lower the amount of undesirable constituents in exhaust gas. The antiknock and glyceride are preferably added to the gasoline as an additive mixture.

Abstract: Lubricating oil compositions having substantially reduced pour points are prepared by incorporating an effective pour depressant amount of an oil-soluble copolymer of ethylene and a vinyl ester of a lower saturated monobasic aliphatic carboxylic acid in a paraffinic, waxy-type, residual lubricating oil base stock. The copolymers, in which the lower saturated monobasic carboxylic component of the ester has from 2 to 6 carbon atoms, have molecular weights of about 16,000 to about 31,000 and which contain about 17 to about 42 weight percent of the vinyl ester, can be added to the lubricating base stock in the form of an emulsion, as a hydrocarbon solution or in any other convenient manner.