Abstract: A method for mitigating preignition events in a hydrogen internal combustion engine. The method includes providing a dosing system in fluid communication with a dosing cylinder of a cylinder block of the hydrogen internal combustion engine; introducing a lubricant including a base oil, a polymer, or mixtures thereof to an intake area of the dosing cylinder via the dosing system; and initiating operating conditions for the hydrogen internal combustion engine.

Abstract: This invention relates to a lubricating oil composition comprising or resulting from the admixing of: (i) at least 50 mass %, based upon the weight of the lubricating oil composition, of base oil, (ii) at least one capped dispersant having number average molecular weight (Mn) of less than 1600 g/mol, (iii) at least one magnesium containing detergent, (iv) at least one calcium containing detergent, (v) at least one copolymer viscosity modifier that has: 1) a ratio of relative KV140/relative KV20 of 1.9 or more; 2) a ratio of relative KV100/relative KV70 or 1.30 or more; and 3) a viscosity index (ASTM 2270D) of 320 or more, when 1), 2) and 3) are measured on blend, having a KV100 of about 8 cSt, of the copolymer viscosity modifier and a group III base oil having a KV100 (ASTM D445) of about 4 cSt and a viscosity index (ASTM D2270) of about 120.