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Laboratory tests have shown that 40% glass-reinforced PPS is suitable for automotive underhood use where it comes into contact with used engine oil, gasoline/alcohol, gasoline/MTBE, water, water/ethylene glycol, hydraulic fluid, and transmission fluid at elevated temperatures. On exposure to water or water/ethylene glycol at 248° F (120° C) and 257°F (125°C), respectively, there is a sharp decline in mechanical strength in the first few weeks with little change thereafter. The residual strength of the 40% glass-reinforced PPS is comparable to, or better than other materials, such as phenolics, which have proved satisfactory in such usage. These results have been translated to successful applications in heavy duty diesel engines. Piston cooling nozzles and water pump impellers made of 40% glass-reinforced PPS have undergone successful engine component evaluations.

Extensive laboratory and field test data are presented on multigrade motor oils formulated with a new VI improver developed by Phillips Petroleum Company. This VI improver is a hydrogenated copolymer of butadiene and styrene. Its unique features are outstanding shear and oxidation stability, and excellent performance in Caterpillar 1-H diesel tests. Attention is focused not only on the unique features but on its overall performance in multigraded oils. Although this VI improver was originally developed for passenger car multigrade oils, data are present to show application in truck multigrade oils, high VI hydraulic oils, automatic transmission fluids, farm tractor hydraulic fluids, and use as a VI improver and thickener in several synthetic oils.