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US 6,281,173 B1Granted
Two-stroke motorcycle lubricant
AssigneeCastrol Limited
InventorsYas Tanaka, Paul Fritz-Johnson, Howard Silver, David James Atkinson
Life of this patent
Estimating the term…
Abstract
A two-stroke motorcycle lubricant comprising a base oil having a viscosity at 100° C. of less than 8 cSt and a pour point below −30° C., preferably below −39° C. The two-stroke motorcycle lubricant further comprises a detergent system based on an ashless, oil-soluble amine. The two-stroke motorcycle lubricant exhibits high levels of cleanliness and low levels of exhaust smoke, whilst maintaining high load carrying capacity. The two-stroke motorcycle lubricant may be dyed.
Claims21
A method of lubricating a two-stroke motorcycle engine comprising:
- (a) providing to a two-stroke motorcycle engine as a base oil lubricant a mineral oil derived from a naphthenic crude source having a viscosity of 100° C. of less than 4 cSt and a pour point below −30° C., so as to improve detergency, reduce blocking of exhausts and catalysts, and produce low levels of smoke.
Dependencies are inferred from the claim text.