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METHOD FOR PREVENTING OR REDUCING LOW SPEED PRE-IGNITION

  • US 20150322367A1
  • Filed: 05/07/2015
  • Published: 11/12/2015
  • Est. Priority Date: 05/09/2014
  • Status: Abandoned Application
First Claim
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1. A method for preventing or reducing low speed pre-ignition in an engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil, said formulated oil having a composition comprising a lubricating oil base stock as a major component;

  • and at least one detergent, as a minor component;

    wherein said detergent comprises at least one alkaline earth metal salt of an organic acid, and said at least one alkaline earth metal salt of an organic acid comprises at least one magnesium salt of an organic acid; and

    wherein the engine exhibits greater than 50% reduced low speed pre-ignition, based on normalized low speed pre-ignition (LSPI) counts per 25,000 engine cycles, engine operation at 2000 revolutions per minute (RPM) and brake mean effective pressure (BMEP) at 18 bar, as compared to low speed pre-ignition performance achieved in an engine using a lubricating oil that does not comprise at least one magnesium salt of an organic acid.

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