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In Biodiesel Fuel Research Working Group(WG) of Japan Auto-Oil Program(JATOP), some impacts of high biodiesel blends have been investigated from the viewpoints of fuel properties, stability, emissions, exhaust aftertreatment systems, cold driveability, mixing in engine oils, durability/reliability and so on. This report is designed to determine how high biodiesel blends affect oil quality through testing on 2005 regulations engines with DPFs. When blends of 10-20% rapeseed methyl ester (RME) with diesel fuel are employed with 10W-30 engine oil, the oil change interval is reduced to about a half due to a drop in oil pressure. The oil pressure drop occurs because of the reduced kinematic viscosity of engine oil, which resulting from dilution of poorly evaporated RME with engine oil and its accumulation, however, leading to increased wear of piston top rings and cylinder liners.

This paper describes a new hybrid fuel technique for improving the thermal efficiency and fuel economy of SI engines. A new type of fuel additive that has friction modification effects was evaluated. By treating gasoline with this additive, a fuel economy benefit of up to 2.4%, which means a 2.4% reduction in carbon dioxide emissions from vehicles, has been attained in a modified Japanese 10-15 mode test. Improvements in the engine power and vehicle acceleration were also observed due to application of this technique. No-harm tests were also conducted, and it was found that this technique exhibited no significant harmful side effects in the tests conducted in this program.