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Effects of Low-viscosity Engine Oil on Fuel Economy and Wear

Article of Honda R&D Technical Review Vol.22 No.2

Summary

The effects of lower engine oil viscosity on fuel economy and engine reliability were investigated, unhampered by the SAE viscosity standard, with the aim of enhancing fuel economy. The fuel economy effects were predicted by using low-viscosity engine oil and measuring the friction torque. The results showed that lowering the engine oil viscosity provides favorable prospects for enhancing fuel economy.
Engine reliability was investigated by confirming the effects on sliding wear at high temperature, which is the greatest issue for low-viscosity engine oil. These effects were confirmed through CAE analysis and engine endurance tests. The results provided prospects for wear resistance of sliding parts at high temperature, even when using engine oil with a lower viscosity than specified in the SAE viscosity standard in the tested mass-production engine.
In addition, a number of prototype engine oils with a lower viscosity than specified in the SAE viscosity standard were created, and the property values and positioning of these prototype engine oils relative to the SAE viscosity standard were confirmed.
Engine oil with a lower viscosity than specified in the current SAE viscosity standard can be expected to further enhance fuel economy, so the establishment of further low-viscosity standards is desired.

Reference

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Author (organization or company)

Yosuke OKUYAMA(Automobile R&D Center)、Daichi SHIMOKOJI(Automobile R&D Center)、Syouji KAWAUCHI(Automobile R&D Center)、Takeshi HATTA(Automobile R&D Center)、Masashi MARUYAMA(Automobile R&D Center)

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