Method for preventing or reducing low speed pre-ignition in direct injected spark-ignited engines with manganesemanganese-containing lubricant
AssigneesChevron Oronite Company LLC, Chevron U.S.A. Inc.
InventorsIan G. Elliott, Amir Gamal Maria, Richard Eugene Cherpeck, Theresa Liang Gunawan, Andrew M. Thomas
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Abstract
Disclosed is a lubricating engine oil composition for a direct injected, boosted, spark ignited internal combustion engine comprising from about 25 to about 3000 ppm of metal from at least one manganese-containing compound, based on the total weight of the lubricating oil. Also disclosed is a method for preventing or reducing low speed pre-ignition in an engine lubricated with said lubricating engine oil composition.
Claims10
A method for preventing or reducing low speed pre-ignition in a direct injected, boosted, spark ignited internal combustion engine, said method comprising the step of lubricating the crankcase of the engine with a lubricating oil composition comprising from about 25 to about 3000 ppm of metal from at least one manganese-containing compound, based on the total weight of the lubricating oil composition, wherein the at least one manganese-containing compound has the following formula:
- wherein α is +2 or +3 oxidation state, RD is a branched, saturated hydrocarbon moiety having from 1 to about 30 carbon atoms, n is an integer from 0 to 3, L is absent or a ligand that saturates the coordination sphere of manganese, and x is an integer from 0 to 6.
A lubricating engine oil composition for use in a down-sized boosted engine comprising a lubricating oil base stock as a major component;
- and at least one manganese-containing compound, as a minor component;
- wherein the at least one manganese-containing compound has the following formula:
- wherein α is +2 or +3 oxidation state, RD is a branched, saturated hydrocarbon moiety having from 1 to about 30 carbon atoms, n is an integer from 0 to 3, L is absent or a ligand that saturates the coordination sphere of manganese, and x is an integer from 0 to 6;
- and wherein the downsized engine ranges from 0.5 liters to 3.6 liters.
Dependencies are inferred from the claim text.