Marine Engine Lubrication
OwnerMinh Doan, Terence Garner +1inventors
InventorsMinh Doan, Terence Garner, Frederick W. Girshick
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Abstract
A two-stroke or four-stroke marine engine lubricating oil composition comprising an oil of lubricating viscosity in a major amount and (A) additives in respective minor amounts; and (B) a polymethacrylate viscosity modifier. Preferably, brightstock is completely or substantially absent from the composition.
Claims13
A two-stroke or four-stroke marine engine lubricating oil composition comprising an oil of lubricating viscosity in a major amount and
- (A) additives, in respective minor amounts;
- and
- (B) a viscosity modifier in the form of a polymethacrylate in an amount in the range of 0.05-6 mass %,
- wherein the composition includes less than 0.5 mass % of brightstock;
- and
- wherein the two-stroke marine engine lubricating oil composition has a TBN of 40 to 100 mg KOH/g, as calculated using ASTM D2896, or the four-stroke marine engine lubricating oil composition has a TBN of 20 to 60 mg KOH/g, as calculated using ASTM D2896.
A method of reducing the amount of brightstock in a two-stroke or four-stroke marine engine lubricating oil composition comprising an oil of lubricating viscosity in a major amount and (A) additives, in respective minor amounts;
- the method comprising the step of replacing, in part or in full, the brightstock with 0.05 to 6 mass % of (B) a viscosity modifier in the form of a polymethacrylate.
Dependencies are inferred from the claim text.