Method for reduction of abnormal combustion events

A method to reduce abnormal combustion events in the operation of a spark ignited internal combustion engine comprising:

• (i) providing a lubricating oil composition to the crankcase of a spark ignited internal combustion engine;
• (ii) providing fuel to the spark ignited internal combustion engine;
• and
• (iii) combusting the fuel in the spark ignited internal combustion engine;
• wherein:
• 1) The lubricating oil composition comprises or results from the admixing of:
• (i) 50 mass % or more of base oil,
• (ii) detergent providing at least 800 ppm Mg, and less than 500 ppm Ca;
• and
• (iii) abnormal combustion event inhibitor compound(s) comprising at least one phosphorus containing compound providing greater than 0.12 mass % phosphorus, based upon the weight of the lubricating oil composition;
• 2) said lubricating oil composition is identified by the viscometric descriptor SAE OW-X, SAE 5W-X, or SAE 10W-X, where X is 8, 12, 16, 20, or 30;
• and
• wherein the fuel comprises an e-fuel, a hydrogen fuel, a co-blended fuel, or a combination thereof including one or more abnormal combustion event promotors selected from the group consisting of hydrogen, ethanol, tetralin, di-isobutylene, dimethyl furan, methyl furan, a combination of dimethyl furan and methyl furan, cyclopentanone, ethanol, methanol, prenol, isobutanol, n-propanol, isopropanol, and a combination of ethanol, isobutanol, 2-methyl-1-butanol, ethanol benzene, and 3-methyl-1-butanol;
• wherein the fuel has an octane number that is at least 2 less than the internal combustion engine's minimum fuel octane rating;
• and
• 3) when said lubricating oil composition is used with fuel having an octane number that is at least 2 less than the internal combustion engine's minimum fuel octane rating, the combination completes at least 1 iteration of 175,000 cycles per iteration, as determined by Sequence IX Test, ASTM D829.

A method to reduce abnormal combustion events in the operation of a spark ignited internal combustion engine comprising:

• (i) providing a lubricating oil composition to the crankcase of a spark ignited internal combustion engine;
• (ii) providing fuel to the spark ignited internal combustion engine;
• and
• (iii) combusting the fuel in the spark ignited internal combustion engine;
• wherein:
• 1) The lubricating oil composition comprises or results from the admixing of:
• (i) 50 mass % or more of base oil,
• (ii) detergent providing at least 800 ppm Mg;
• (iii) one or more abnormal combustion event inhibitors comprising a phosphorus containing compound, one or more of B, Si, and or Mo containing compounds, where abnormal combustion event inhibitors provide at least 1200 ppm P;
• 2) said lubricating oil composition is identified by the viscometric descriptor SAE 10W-X, SAE 5W-X or SAE OW-X, where X is 8, 12, 16, 20, or 30;
• 3) the fuel comprises co-blended fuel comprising hydrocarbon or hydrogen fuel blended with one or more of ethanol, methanol, isopropanol, isobutanol, n-propanol, prenol, dimethyl furan, methyl furan, cyclopentanone, 2-methyl-1-butanol, ethanol benzene, and 3-methyl-1-butanol;
• wherein the fuel has an octane number that is at least 2 less than the internal combustion engine's minimum fuel octane rating;
• and
• wherein the average LSPI event count upon combusting the fuel in the spark ignited internal combustion engine is less than 2.

A lubricating oil composition comprising or resulting from the admixing of:

• (i) 50 mass % or more of base oil,
• (ii) detergent providing at least 500 ppm Mg, and less than 500 ppm Ca to the lubricating oil composition;
• and
• (iii) abnormal combustion event inhibitor compound(s) comprising at least one phosphorus containing compound providing greater than 1200 ppm phosphorus, to the lubricating oil composition, based upon the weight of the lubricating oil composition;
• wherein the average LSPI event count upon combusting a fuel comprising an e-fuel, a hydrogen fuel, a co-blended fuel, or a combination thereof in a spark ignited internal combustion engine is less than 2;
• wherein the fuel includes one or more abnormal combustion event promotors selected from the group consisting of hydrogen, ethanol, tetralin, di-isobutylene, dimethyl furan, methyl furan, a combination of dimethyl furan and methyl furan, cyclopentanone, ethanol, methanol, prenol, isobutanol, n-propanol, isopropanol, and a combination of ethanol, isobutanol, 2-methyl-1-butanol, ethanol benzene, and 3-methyl-1-butanol;
• and
• wherein the fuel has an octane number that is at least 2 less than the internal combustion engine's minimum fuel octane rating.