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Development of ILSAC GF-4 0W-20 Gasoline Engine Oil

Article of Honda R&D Technical Review Vol.16 No.2


This paper describes the development of an 0W-20 engine oil meeting the ILSAC GF-4 engine oil standard which will go into effect from July 31st, 2004.
The GF-4 engine oil standard stipulates upper limits for phosphorus and sulfur content in oil to prevent poisoning the exhaust system components, but the new standard has generated concerns about the acceleration of wear of engine parts. Each additive in the newly developed has been selected to improve anti-wear performance. In addition, the contribution of kinematic viscosity and HTHS viscosity to engine motoring friction has been verified, and the molecular weight of the viscosity index improver has been optimized to achieve the higher fuel economy requirement in GF-4.
The newly developed engine oil was evaluated in GF-4 standard tests and was confirmed to meet GF-4 performance.


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Author (organization or company)

Takayuki SATO(Tochigi R&D Center)、Syouji KAWAUCHI(Tochigi R&D Center)

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