Lubricant Compositions For Direct Injection Engines
Patent No. EP3878933 (titled "Lubricant Compositions For Direct Injection Engines") was filed by The Lubrizol on Sep 19, 2014. The application was issued on Nov 5, 2025.
Patent Summary
This method reduces low-speed pre-ignition (LSPI) events in spark-ignited direct injection internal combustion engines operated at speeds $\le$ 3,000 rpm and brake mean effective pressure (BMEP) $\ge$ 10 bars. The method comprises supplying a lubricant composition consisting of a base oil of lubricating viscosity, an ashless antioxidant, and a polyalkenyl succinimide dispersant present at 0.5 to 4 weight %. The ashless antioxidant comprises one or more of a phenol antioxidant (e.g., 2,6-dialkyl phenol), an arylamine antioxidant (e.g., diarylamine), a sulfurized olefin antioxidant, or combinations thereof. The composition may further include phosphorus-containing anti-wear agents, metal-containing overbased detergents, friction modifiers, or viscosity modifiers to further inhibit abnormal combustion and engine damage.
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Dossier Documents
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Date
Description
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EP3878933
- Application Number
- EP21155770A
- Filing Date
- Sep 19, 2014
- Status
- Granted And Under Opposition
- Oct 3, 2025
- Publication Date
- Nov 5, 2025
- External Links
- Slate, Register , Google Patents