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New standard for four-stroke diesel engine oils: JASO DH-1
Published May 23, 2001 by Society of Automotive Engineers of Japan in Japan
Event: JSAE Spring Conference
This paper reviews the development of a new standard for four-stroke diesel engine oils, JASO DH-1 (JASO M355).
This standard was introduced to the market on April 1, 2001. This standard prescribes the minimum performance for engine oils conforming to four-stroke diesel engines, manufactured in Japan.
This standard is composed of four engine tests and seven bench tests. The engine tests include a piston detergency test (JASO M336-98), valve train wear test (JASO M354-99), soot dispersancy test (ASTM D 5967-99) and high temperature anti- oxidation test (ASTM D 5533-97a). The piston detergency test and the valve train wear test were developed in Japan. The bench tests measure hot surface deposit, anti-forming, volatility, anti-corrosion, shear-stability, total base number and seal compatibility.