Method for analyzing engine oil degradation
First Claim
1. A method for detecting degradation of an engine oil comprising:
- separating an engine oil sample into a polar component and a non-polar component; and
analyzing the polar component for one or more degradation indicators selected from the group consisting of antioxidants, acid content, and combinations thereof, wherein said degradation indicators relate to a degree of engine oil degradation.
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Abstract
The present disclosure provides a method for detecting degradation of an engine oil, by separation into a polar component and a non-polar component via admixture with a polar solvent having a polarity index greater than or equal to 5 and optionally a non-polar solvent having a polarity index of less than or equal to about 1. The polar component is analyzed for one or more degradation indicators selected from the group consisting of antioxidants, acid content, and combinations thereof. Such degradation indicators relate to a degree of engine oil degradation. The polar component may be analyzed by Gas Chromatography and Mass Spectrometry (GC/MS) for the one or more degradation indicators, which can provide a semi-quantitative level of such degradation indicator species. The non-polar component identifies combustion products that help to explain the level of degradation.
18 Citations
22 Claims
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1. A method for detecting degradation of an engine oil comprising:
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separating an engine oil sample into a polar component and a non-polar component; and analyzing the polar component for one or more degradation indicators selected from the group consisting of antioxidants, acid content, and combinations thereof, wherein said degradation indicators relate to a degree of engine oil degradation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for detecting engine oil degradation comprising:
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determining a first amount of one or more degradation indicators selected from the group consisting of antioxidants, acid content, and combinations thereof in a first engine oil composition, by separating said first engine oil composition into a polar component and a non-polar component and analyzing said polar component, wherein said first amount of said one or more degradation indicators relates to a degree of degradation of said first engine oil composition; determining a second amount of one or more degradation indicators selected from the group consisting of antioxidants, acid content, and combinations thereof in a second engine oil composition that is distinct from said first engine oil composition, by separating said second engine oil composition into a polar component and a non-polar component and analyzing said polar component, wherein said second amount of said one or more degradation indicators relates to a degree of degradation of said second engine oil composition; and comparing said first amount of said one or more degradation indicators to said second amount of said one or more degradation indicators to determine the relative engine oil degradation of said first oil composition as compared to said second oil composition. - View Dependent Claims (16, 17, 18, 19)
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20. A method for detecting degradation of an engine oil comprising:
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admixing an engine oil sample with a polar solvent comprising alkanol to form a mixture;
agitating said mixture; and
permitting said mixture to separate for at least twenty-four hours to form a polar component and a non-polar component; andanalyzing said polar component by gas chromatography/mass spectrometry (GC/MS) to determine a presence of one or more degradation indicator species selected from the group consisting of antioxidants, acid content, and combinations thereof, which relate to a degree of engine oil degradation. - View Dependent Claims (21, 22)
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Specification