Abstract: A diesel fuel containing a soot dispersant additive which is a grafted and derivatized low molecular weight copolymer of ethylene and at least one C3-C10 alpha monoolefin is provided. Also provided is a method for improving the fuel economy of a diesel engine which comprises operating the diesel engine with a fuel composition comprising (a) a major amount of a diesel fuel and (b) a minor fuel economy improving effective amount of the soot dispersant additive.

Abstract: A method is disclosed for reducing the freezing point of unleaded aminated aviation gasoline to ?58° C. or lower by the addition of tert-amylphenylamine.

Abstract: This invention provides a fuel composition having a sulphur content of not more than 50 ppm by weight and comprising at least 50 ppm based on the total weight of the fuel composition of at least one fused polycyclic aromatic compound which comprises at least one exocyclic group containing nitrogen wherein the nitrogen is attached directly to a ring carbon atom. Specific examples of such compounds include 1-amino naphthalene, 1,8-diaminonaphthalene, or 5-aminoindole, 2-(2-aminophenyl)indole and 8-aminoquinoline. These compounds are capable of improving the antiwear and lubricity properties of a low sulphur fuel when compared with that of the same fuel in the absence of such compounds.

Abstract: The present invention relates to derivatives of polyalkenyl amine substituted with numerous hydroxy groups of the following formula (I) useful as a novel fuel detergent. ##STR1## wherein polyalkenyl denotes a branched alkyl derived from polyolefin which has a molecular weight of 400.about.5,000 and is prepared with olefin having 2 to 6 carbon atoms; m is an integer ranging from 2 to 10, R.sup.1, R.sup.2 and R.sup.3 may be identical or different, and represent a hydrogen atom or a linear or branched alkyl having 1 to 4 carbon atoms: R.sup.4 and R.sup.5 may be identical or different, and denote a hydrogen atom, a C.sub.1 -C.sub.10 alkyl group, a hydroxyalkyl, a phenyl, naphthyl, an aminoalkyl of formula (II) or a polyaminoalkylene of formula (III) ##STR2## wherein R.sup.6 denotes a C.sub.2 -C.sub.10 alkylene group: R.sup.7 and R.sup.8 may be identical or different, and denote a hydrogen atom, a C.sub.1 -C.sub.10 alkyl group, a phenyl, a naphthyl or a C.sub.1 -C.sub.

Abstract: A method for detecting naphthylamines which are present as tracers in mineral oils, wherein the naphthylamine is extracted by treating the mineral oil with an aqueous medium, and is coupled in the aqueous phase with a diazonium salt to form an azo dye, the use of specific naphthylamines as tracers in mineral oils and mineral oils containing these specific naphthylamines.

Abstract: Petroleum fuels are tagged with markers having the formula: ##STR1## where R.sup.1 and R.sup.2 are selected from H, methyl, ethyl, methoxy, halogen, cyano and nitro and R.sup.3 is selected from methyl, methoxy methoxyethoxy and morpholino.

Abstract: Liquid petroleum products are tagged with a marker which is a compound or mixture of compounds having the formula: ##STR1## wherein R.sup.1 is C.sub.1 -C.sub.6 alkyl, and R.sup.2 and R.sup.3 are nothing or --O--(C.sub.1 -C.sub.3 alkyl).