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Lubricants with overbased calcium and overbased magnesium detergents and method for improving low-speed pre-ignition

  • US 10,443,011 B2
  • Filed: 01/18/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 01/18/2017
  • Status: Active Grant
First Claim
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1. A lubricating oil composition comprising:

  • greater than 50 wt. % of a base oil of lubricating viscosity, based on a total weight of the lubricating oil composition;

    a sufficient amount of one or more overbased calcium-containing detergents having a total base number of greater than 225 mg KOH/g, measured by the method of ASTM D-2896, to provide greater than 1000 ppm calcium to the lubricating oil composition;

    one or more overbased magnesium-containing detergents having a total base number of greater than 225 mg KOH/g, measured by the method of ASTM D-2896, wherein the total amount of magnesium provided by the one or more overbased magnesium-containing detergents to the lubricating oil composition 50-1500 ppm; and

    one or more molybdenum compounds providing a total amount of molybdenum to the lubricating composition of 25-1000 ppm;

    wherein a ratio of the wt. % of calcium in the lubricating oil composition from the one or more overbased calcium-containing detergents to the wt. % of magnesium in the lubricating oil composition from the one or more overbased magnesium-containing detergents is less than 11.9;

    a ratio of the total ppm of magnesium in the lubricating oil composition to the total TBN of the lubricating oil composition in mg KOH/g of the lubricating oil composition, measured by the method of ASTM D-2896, is greater than 19; and

    a ratio of the total ppm of calcium in the lubricating oil composition to the total TBN of the lubricating oil composition in mg KOH/g of the lubricating oil composition, measured by the method of ASTM D-2896, is less than 222.

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