Lubricating Composition
AssigneeInfineum International Limited
InventorsRobert W. Shaw, Simon R. Crick, Carina E. Foster
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Abstract
A method of reducing low-speed pre-ignition (LSPI) in a direct-injected spark-ignited internal combustion engine comprising lubricating the crankcase of the engine with a composition comprising a combination of a molybdenum-containing additive and a boron-containing additive. Preferably, the composition comprises a calcium detergent providing a calcium content of at least 0.08 wt. %, based on the weight of the lubricating oil composition.
Claims29
A method of reducing low-speed pre-ignition (LSPI) events in a direct-injection spark-ignition internal combustion engine comprising lubricating the crankcase of the engine with a lubricating oil composition, the lubricating oil composition comprising a calcium detergent providing the lubricating oil composition with a calcium content of from 0.08 to 0.5 wt %, based on the weight of the lubricating oil composition, a boron-containing additive and a molybdenum-containing additive, said lubricating oil composition having a molybdenum content of from 150 ppm to 1500 ppm by weight, based on the weight of the lubricating oil composition, and having a boron content of from 150 ppm to 1500 ppm by weight, based on the weight of the lubricating oil composition;
- a magnesium content of no more than 0.12 wt % based on the weight of the lubricating oil composition, and a phosphorus content of no more than 0.12 wt %, based on the weight of the lubricating oil composition.
-10. (canceled)
A method according to claim 10, wherein the lubricating oil composition has a magnesium content of no more than 0.12 wt. %, based on the weight of the lubricating oil composition.
(canceled)
Dependencies are inferred from the claim text.