Development of a New Multigrade Engine Oil for Improved Wear Resistance in Heavy Vehicle Diesel Engines—PART I: Diesel Soot and Valve Train Wear

Yasunori Hirose; Toshio Kunoki; Kohji Kawashima; Sakunobu Kanai; Kyoshiro Hirami

doi:10.4271/852134

1985-10-01

Development of a New Multigrade Engine Oil for Improved Wear Resistance in Heavy Vehicle Diesel Engines—PART I: Diesel Soot and Valve Train Wear 852134

The goal of the present investigation is to develop suitable high quality SAE10W-30 engine oils for the next generation of heavy duty diesel engines with improved fuel economy, output, emission control performance, etc. To achieve these goals, methods of improving antiwear performance of diesel engine oils were investigated, since upgrading antiwear performance is a critical factor in future developments.

The paper, mainly through motoring engine tests, focuses on the effects of diesel soot on valve train wear and the possibility of reducing wear caused by soot. The results demonstrated that diesel soot clearly increased valve train wear and that the wear seemed to vary according to the surface properties of the soot. It was furthermore found that surface properties could be controlled by varying the additive compositions of engine oils, and that valve train wear caused by soot might be reduced by lubricants with carefully selected detergents, ashless dis-persants, or zinc dithiophosphates.

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Development of a New Multigrade Engine Oil for Improved Wear Resistance in Heavy Vehicle Diesel Engines—PART I: Diesel Soot and Valve Train Wear 852134

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