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METHOD FOR PREVENTING OR REDUCING LOW SPEED PRE-IGNITION

  • US 20150322369A1
  • 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 zinc-containing compound or at least one antiwear agent, as a minor component;

    wherein said at least one antiwear agent comprises at least one zinc dialkyl dithiophosphate compound derived at least in part from a secondary alcohol; and

    wherein the engine exhibits greater than 20% 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 oilthat does not comprise at least one zinc-containing compound or antiwear agent.

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