METHOD FOR PREVENTING OR REDUCING LOW SPEED PRE-IGNITION
First Claim
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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Accused Products
Abstract
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. The formulated oil has a composition including 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. The at least one antiwear agent includes at least one zinc dialkyl dithiophosphate compound derived from a secondary alcohol. A lubricating engine oil having a composition including 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. The lubricating oils of this disclosure are particularly advantageous as passenger vehicle engine oil products.
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Citations
36 Claims
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
- and at least one zinc-containing compound or at least one antiwear agent, as a minor component;
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26. A lubricating engine 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 oil that does not comprise at least one zinc-containing compound or antiwear agent. - View Dependent Claims (27, 28, 29)
- and at least one zinc-containing compound or at least one antiwear agent, as a minor component;
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30. 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 engine oil, said formulated engine oil having a composition comprising a lubricating oil base stock at from 70 to 85 wt. %;
- and at least one zinc-containing compound or at least one antiwear agent, at a loading to contribute from 400 ppm to about 2000 ppm of phosphorous to the formulated engine oil;
wherein said at least one antiwear agent comprises at least one zinc dialkyl dithiophosphate compound derived at least in part from a secondary alcohol;
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 zinc-containing compound or at least one antiwear agent. - View Dependent Claims (31, 32, 33, 34, 35, 36)
- and at least one zinc-containing compound or at least one antiwear agent, at a loading to contribute from 400 ppm to about 2000 ppm of phosphorous to the formulated engine oil;
Specification