Method for using lubricating oil composition and method for evaluating degradation
AssigneeIdemitsu Kosan Co., Ltd.
InventorsMoritsugu Kasai, Tatsuya Kusumoto
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Abstract
A method for utilizing a lubricating oil composition in which the content of a metal-based cleaning agent (X) having a base value of 100 mgKOH/g or less is 630 mass ppm or less in terms of metal atoms, and the content of sulfated ash is 1.5 mass % or less. The method includes measuring at least one physical property value among the capacitance and the dielectric constant of the lubricating oil composition while using the lubricating oil composition, and evaluating the progress of degradation of the lubricating oil composition.
Claims7
A method for using a lubricating oil composition, comprising:
- measuring a value of at least one physical property selected from an electrostatic capacity and a dielectric constant of a lubricating oil composition in use;
- and
- evaluating a progress of degradation of the lubricating oil composition from the value of at least one physical property selected from the electrostatic capacity and the dielectric constant of the lubricating oil composition,
- wherein a content of a metal-based detergent having a base number of 100 mgKOH/g or less is 630 mass ppm or less in terms of metal atoms in the lubricating oil composition, a content of sulfated ash is 1.5 mass % or less in the lubricating oil composition, and the measuring of the value of at least one physical property comprising measuring the value using at least one comb-type electrode at a single frequency of from 20 Hz to 120 Hz.
A method for evaluating degradation of a lubricating oil composition, comprising:
- measuring a value of at least one physical property selected from an electrostatic capacity and a dielectric constant of a lubricating oil composition;
- and
- evaluating a progress of degradation of the lubricating oil composition from the value of at least one physical property selected from the electrostatic capacity and the dielectric constant of the lubricating oil composition,
- wherein a content of a metal-based detergent having a base number of 100 mgKOH/g or less is 630 mass ppm or less in terms of metal atoms in the lubricating oil composition, a content of sulfated ash is 1.5 mass % or less in the lubricating oil composition, and the measuring of the value of at least one physical property includes measuring the value using at least one comb-type electrode at a single frequency of from 20 Hz to 120 Hz.
A lubricating oil composition, wherein a content of a metal-based detergent having a base number of 100 mgKOH/g or less is 630 mass ppm or less in terms of metal atoms in the lubricating oil composition, a content of sulfated ash is 1.5 mass % or less in the lubricating oil composition, the lubricating oil composition has a degraded state presented by measuring at least one physical property selected from an electrostatic capacity and a dielectric constant thereof, and the measuring of the at least one physical property includes measuring the value using at least one comb-type electrode at a single frequency of from 20 Hz to 120 Hz.
Dependencies are inferred from the claim text.