Low Viscosity Engine Oil Combating Deposit Formation
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Solution Overview
Problem
Existing lubricating oil compositions for internal combustion engines often include friction modifiers that can cause detrimental effects such as increased deposit formation, seal failure, and decreased engine component wear, while also competing with anti-wear additives for surface sites.
Innovation Solution
The development of low viscosity lubricating oil compositions that improve fuel economy without significant amounts of added friction modifiers, comprising a major amount of oil of lubricating viscosity, an alkaline earth metal sulfonate detergent, and a comb-shaped polymethacrylate viscosity modifier with a Permanent Shear Stability Index (PSSI) of less than 15.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If friction modifiers are added to lubricating oil to improve fuel economy, then fuel economy is improved, but deposit formation increases and seal life decreases
Solution Approach 1:
The invention removes friction modifiers from the lubricating oil composition entirely, extracting the harmful component while maintaining fuel economy benefits through low viscosity base oil and alternative additive packages including zinc dialkyl dithiophosphate and calcium sulfonate
2Use of energy by moving object
If friction modifiers are added to lubricating oil to improve fuel economy, then fuel economy is improved, but seal failure increases
Solution Approach 1:
The invention removes friction modifiers that cause seal degradation while maintaining fuel economy performance through alternative mechanisms including low viscosity base oil and protective additives like zinc dialkyl dithiophosphate and calcium sulfonate that do not harm seals
3Use of energy by moving object
If friction modifiers are present with anti-wear additives, then fuel economy is improved, but anti-wear film formation is reduced due to competition for surface sites
Solution Approach 1:
The invention removes friction modifiers that compete with anti-wear additives for surface sites, allowing zinc dialkyl dithiophosphate and other anti-wear additives to form effective protective films while maintaining fuel economy through low viscosity base oil
Solution Approach 2:
The invention changes the chemical composition parameters by eliminating friction modifiers and optimizing the ratios of anti-wear additives and detergents, creating a synergistic additive package that provides both wear protection and fuel economy without site competition
4Use of energy by moving object
If low viscosity lubricating oil is used to improve fuel economy, then fuel economy is improved, but viscosity stability under shear stress decreases
Solution Approach 1:
The invention uses comb-shaped polymethacrylate viscosity modifiers with specifically controlled molecular weight and architecture (PSSI < 15) that provide exceptional shear stability, preventing viscosity breakdown while maintaining low initial viscosity for fuel economy
Data Source
AI summary
The present application pertains to a lubricating oil composition for an internal combustion engine that advantageously which exhibits improved fuel economy. The composition may comprise a major amount of oil of lubricating viscosity, an alkaline earth metal sulfonate detergent, and a comb-shaped polymethacrylate viscosity modifier. The compositions may be an 0W-8, an 0W-12, an 0W-16, or an 0W-20 SAE viscosity grade and be particularly useful for a hybrid vehicle.