Abstract: A novel diluent composition for handling fuel additives comprising a mixture of hydrocarbons in the avjet boiling range in combination with primary amyl alcohol.

Abstract: A low foaming lubricating oil composition comprising a mineral oil, an oil soluble detergent-like additive which increases the foaming tendency of the lubricating oil, and an effective amount of an estolide of a hydroxy fatty acid having 10 to 24 carbon atoms which reduces the foaming tendency of the lubricating oil composition. The lubricating oil achieves the low foaming tendency without added silicone polymers and has a silicon content of less than about 10 parts per million by weight. The preferred estolide is the estolide of 12-hydroxystearic acid.

Abstract: A fully formulated crankcase lubricating oil composition containing between about 0.1 and 10 wt. % of a tetrapolymer of 4-vinylpyridine (4-VP), a first alkyl methacrylate of the formula: ##STR1## a second alkyl methacrylate of the formula: ##STR2## and a third alkyl methacrylate of the formula: ##STR3## where R is alkyl of from 1 to 6 carbons, R.sup.1 is alkyl of from 10 to 15 carbons and R.sup.2 is alkyl of from 16 to 20 carbons, of a molecular weight between about 25,000 and 2,500,000 having a component ratio of 4-VP:C.sub.1 to C.sub.6 alkyl methacrylate:C.sub.10 -C.sub.15 alkyl methacrylate:C.sub.16 -C.sub.20 alkyl methacrylate of between about 2:10:78:10 and 10:30:30:30 and between about 0.1 and 5 wt. % of a calcium containing rust inhibitor, said composition having a sulfated metal ash content of between about 0.05 and 1 wt. %.