Engine lubricant optimization for advanced sustainable fuels

A method comprising:

• storing in computer-readable memory a first fuel distillation dataset for a lubricant composition operating with a first fuel, a second fuel distillation dataset for the lubricant composition operating with a second fuel;
• calculating with at least one processor a first temperature factor for the first fuel at a reference temperature, wherein the first temperature factor is a function of the first fuel distillation dataset and the reference temperature;
• calculating with the at least one processor an optimized adjustment temperature such that for the second fuel a second temperature factor is equal to a tolerance factor multiplied by the first temperature factor, wherein the second temperature factor is a function of the second fuel distillation dataset and an adjustment temperature;
• adjusting an operational fuel dilution of the lubricant composition in an internal combustion engine based on the optimized adjustment temperature, wherein the internal combustion engine is operating on the second fuel;
• and either:
• (A) obtaining a measured lubricant viscosity with a viscosity sensor in the internal combustion engine, wherein the viscosity sensor is in communication with an engine computer;
• determining with the at least one processor if the measured lubricant viscosity is within a first range of a reference lubricant viscosity;
• calculating with the at least one processor an estimated operational fuel dilution based on the measured lubricant viscosity;
• and
• determining with the at least one processor if the estimated operational fuel dilution is within a second range of a reference fuel dilution;
• or
• (B) calculating with the at least one processor a fuel dilution change, wherein the fuel dilution change is equal to the first overall temperature factor divided by the second overall temperature factor;
• wherein the first fuel distillation dataset includes a first plurality of boiling point fraction datasets for intervals of boiling point of the first fuel, wherein the second fuel distillation dataset comprises a second plurality of boiling point fraction datasets for intervals of boiling point of the second fuel, and wherein each boiling point fraction dataset includes an average boiling temperature and a weight fraction percentage;
• and in (A) or (B)
• wherein adjusting the operational fuel dilution comprises adjusting an engine operating temperature, wherein the adjustment of the engine operating temperature is based on the optimized adjustment temperature.