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Nissan Motor Co. was just granted Patent 8,598,098 for "A lubricant composition ... to significantly lower a friction coefficient ... diamond nano-particle"
The patent lists some test results where adding diamond nanoparticles reduced coefficients of friction. BUT, those results only apply to boundary layer lubrication. They do not apply to engine components which have fluid film lubrication. The improved friction may apply to cam lobes, especially at low RPM. Most engine components have fluid film lubrication, where the friction losses are proportional to lubricant viscosity. Since only a small part of engine friction is caused by boundary lubrication, the end result of adding the diamond nanoparticles will be only a small reduction in total engine friction. A small reduction in engine friction is an even improvement in gas mileage.
All of which is why he did not respond to my challenge to test his additive and pay double or nothing depending on the results.
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06 Canyon: The vacuum gauge plus wheel covers helped increase summer 2015 mileage to 38.5 MPG, while summer 2016 mileage was 38.6 MPG without the wheel covers. Drove 33,021 miles 2016-2018 at 35.00 MPG.
22 Maverick: Summer 2022 burned 62.74 gallons in 3145.1 miles for 50.1 MPG. Winter 2023-2024 - 2416.7 miles, 58.66 gallons for 41 MPG.
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