Provided is a lubricating oil composition, including: a vegetable oil (A); a zinc dithiophosphate (B); and an amine-based antioxidant (C), wherein a total content of linoleic acid and linolenic acid among constituent fatty acids of the vegetable oil (A) is less than 20 mass % with respect to a total amount of the constituent fatty acids in the vegetable oil (A), wherein a content of the amine-based antioxidant (C) is 2.00 mass % or more with respect to a total amount of the lubricating oil composition, and wherein when the lubricating oil composition further includes a phosphorus-free phenol-based antioxidant (D), a content of the phosphorus-free phenol-based antioxidant (D) is less than 2.00 mass % with respect to the total amount of the lubricating oil composition.

This invention relates to a lubricating oil composition for a hydrogen fueled internal combustion engine (H2ICE) comprising or resulting from the admixing of: (i) base oil, (ii) a functionalized polymer, (iii) an overbased magnesium based detergent, (iv) an overbased calcium based detergent and (iv) one or more, optionally borated, higher and lower molecular weight PIBSA-PAM dispersants, and one or more zinc hydrocarbyl diphosphate compounds. The composition has a total sulfated ash of less than or equal to 1.0 wt. %, a kinematic viscosity at 100 C. of 5 to 20 cSt, a total phosphorous level of less than or equal to 0.12 wt. %, and a total sulfur level of less than or equal to 0.4 wt. %. The composition provides a reduction in abnormal pre-ignition events during combustion in a H2ICE compared to a comparable composition not including the combination of the functionalized polymer, the higher molecular weight PIBSA-PAM, the lower molecular weight PIBSA-PAM, the overbased magnesium containing detergent, the overbased calcium containing detergent, and the one or more zinc hydrocarbyl diphosphate compounds. Also provided are a method of making the composition, a method of lubricating a hydrogen engine, a method of reducing abnormal combustion events in a H2ICE, and a hydrogen engine oil additive concentrate composition.

This invention relates to a lubricating oil composition for a hydrogen fueled internal combustion engine (H2ICE) comprising or resulting from the admixing of: (i) base oil, (ii) a functionalized polymer, (iii) an overbased magnesium based detergent, (iv) an overbased calcium based detergent and (iv) one or more, optionally borated, higher and lower molecular weight PIBSA-PAM dispersants, and one or more zinc hydrocarbyl diphosphate compounds. The composition has a total sulfated ash of less than or equal to 1.0 wt. %, a kinematic viscosity at 100 C. of 5 to 20 cSt, a total phosphorous level of less than or equal to 0.12 wt. %, and a total sulfur level of less than or equal to 0.4 wt. %. The composition provides a reduction in abnormal pre-ignition events during combustion in a H2ICE compared to a comparable composition not including the combination of the functionalized polymer, the higher molecular weight PIBSA-PAM, the lower molecular weight PIBSA-PAM, the overbased magnesium containing detergent, the overbased calcium containing detergent, and the one or more zinc hydrocarbyl diphosphate compounds. Also provided are a method of making the composition, a method of lubricating a hydrogen engine, a method of reducing abnormal combustion events in a H2ICE, and a hydrogen engine oil additive concentrate composition.

Provided is a coated steel sheet having excellent press formability. The coated steel sheet includes a base steel sheet and, on at least one side of the base steel sheet, a film containing organic resin and wax. The organic resin is at least one selected from the group consisting of acrylic resins, epoxy resins, urethane resins, phenolic resins, vinyl acetate resins, and polyester resins. The wax is polyolefin wax having a melting point that is 100 C. or more and 145 C. or less and an average particle size that is 3.0 m or less. The proportion of the wax in the film is 5 mass % or more and 70 mass % or less. Coating weight variation is 0.300 or less. Coating weight .sub.W of the film is 0.3 g/m.sup.2 or more.

Provided is a coated steel sheet having excellent press formability. The coated steel sheet includes a base steel sheet and, on at least one side of the base steel sheet, a film containing organic resin and wax. The organic resin is at least one selected from the group consisting of acrylic resins, epoxy resins, urethane resins, phenolic resins, vinyl acetate resins, and polyester resins. The wax is polyolefin wax having a melting point that is 100 C. or more and 145 C. or less and an average particle size that is 3.0 m or less. The proportion of the wax in the film is 5 mass % or more and 70 mass % or less. Coating weight variation is 0.300 or less. Coating weight .sub.W of the film is 0.3 g/m.sup.2 or more.