Lubricating oil composition, diesel engine with mounted supercharger, and use method for lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorAkinori Yomogita
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Abstract
A lubricating oil composition may include a base oil (A), succinimide (B) which has not been modified with boron, succinimide (C) modified with boron, a metallic detergent (D), and an antioxidant (E), wherein the ratio of the content of boron atoms derived from ingredient (C) to the content of nitrogen atoms derived from ingredients (B) and (C), B/N, is 0.30 or less by mass, the lubricating oil composition satisfying requirement (I) and/or requirement (II). Requirement (I): Ingredient (D) includes a metallic detergent (D1) having a base value less than 100 mgKOH/g. Requirement (II): Ingredient (E) includes an amine-based antioxidant (E1), the content of ingredient (E1) being 1.00 mass % or less.
Claims20
A lubricating oil composition, comprising:
- a base oil (A);
- a non-boron-modified succinimide (B);
- a boron-modified succinimide (C);
- a metal-based detergent (D);
- and
- an antioxidant (E),
- wherein the lubricating oil composition comprises no organo-molybdenum compound,
- wherein the lubricating oil composition comprises no sodium sulfonate,
- wherein a first B/N mass ratio of boron atoms derived from the boron-modified succinimide (C) to nitrogen atoms derived from the non-boron-modified succinimide (B) and the boron-modified succinimide (C) is 0.30 or less,
- wherein the lubricating oil composition satisfies at least one of requirements (I) and (II):
- requirement (I):
- the metal-based detergent (D) comprises a metal-based detergent (D1) having a base number of less than 100 mgKOH/g, and
- requirement (II):
- the antioxidant (E) comprises an amine-based antioxidant (E1), and a content of the amine-based antioxidant (E1) is 1.00 mass % or less based on total lubricating oil composition mass,
- wherein a content of a phenol-based antioxidant (E2) is 3.00 mass % or less, based on total lubricating oil composition mass, and
- wherein a total content of the amine-based antioxidant (E1) and the phenol-based antioxidant (E2) is 3.40 mass % or less, based on the total lubricating oil composition mass.
Dependencies are inferred from the claim text.