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A new 0W-20 gasoline engine oil was developed to improve fuel economy over ILSAC GF-2 5W-20 gasoline engine oils and to meet ILSAC GF-3 requirements. The main improvements made were to viscosity and friction modifiers. Viscosity at 80°C was adjusted to obtain better fuel economy than with 5W-20 oil in the Japanese 10-15 mode test. Therefore, low-temperature viscosity decreased to 0W and high-temperature high-shear viscosity exceeds 2.6 mPa?s. Friction modifiers and other additives were investigated to find the lowest friction characteristics. The resulting formulation shows more than a 2.0% fuel economy gain in the Japanese 10-15 mode test and the new oil has been certified as meeting ILSAC GF-3 requirements.

Emission regulations for diesel-powered vehicles have been gradually tightening. Installation of after-treatment devices such as diesel particulate filters (DPF), NOx storage reduction (NSR) catalysts, and so on is indispensable to satisfy rigorous limits of particulate matter (PM) and nitrogen oxides (NOx). Japan Clean Air Program II Oil Working Group (JCAPII Oil WG) has been investigating the effect of engine oil on advanced diesel after-treatment devices. First of all, we researched the impact of oil-derived ash on continuous regeneration-type diesel particulate filter (CR-DPF), and already reported that the less sulfated ash in oil gave rise to lower pressure drop across CR-DPF [1]. In this paper, impact of oil-derived sulfur and phosphorus on NSR catalyst was investigated using a 4L direct injection common-rail diesel engine with turbo-intercooler. This engine equipped with NSR catalyst meets the Japanese new short-term emission regulations.