LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES
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United States of America Patent
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Issued Date -
Sep 12, 2024
app pub date -
Jan 27, 2022
filing date -
Mar 23, 2021
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Abstract
A lubricating oil composition for internal combustion engines, including: (A) a lubricating base oil; and (B) a metal-based detergent, wherein the component (B) contains: (B1) a calcium-based detergent in which a content of calcium based on a total mass of the composition is within a specific range; and (B2) a magnesium-based detergent in which a content of magnesium based on the total mass of the composition is within a specific range, the component (B1) contains (B1-1) a calcium-based detergent containing boron and calcium, a content of boron based on the total mass of the composition is 1000 mass ppm or less, a ratio (B(B1)/Ca(B1)) of B(B1) to Ca(B1) is 0.15 or more and 0.35 or less, and a ratio (B(B1)/[Ca(B1)+Mg(B2)]) of B(B1) to a total amount (Ca(B1)+Mg(B2)) of Ca(B1) and Mg(B2) is 0.13 or more and 0.29 or less.
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