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Development of GF-5 0W-20 Fuel-Saving Engine Oil for DLC-Coated Valve Lifters
Technical Paper
2014-01-1478
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
A suitable GF-5 engine oil formulation is investigated to improve the fuel economy of gasoline engines with hydrogen-free DLC-coated valve lifters. Molybdenum dithocarbamate (MoDTC) is shown to be a suitable friction modifier for low viscosity grade engine oils like 0W-20. A suitable Ca salicylate detergent is also determined from several types examined for maximizing the friction reduction effects of MoDTC. The most suitable Ca salicylate has a chemical structure capable of forming a borophosphate glass film on metal surfaces, which is known to improve the effects of MoDTC. A high viscosity index Group III base oil (VI>140) is also effective in improving fuel efficiency. It is further clarified that the structural design of the polymethacrylate viscosity modifier is another important factor in reducing engine friction.
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Citation
Sagawa, T., Katayama, T., Suzuki, R., and Okuda, S., "Development of GF-5 0W-20 Fuel-Saving Engine Oil for DLC-Coated Valve Lifters," SAE Technical Paper 2014-01-1478, 2014, https://doi.org/10.4271/2014-01-1478.Also In
References
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