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This paper briefly reviews cylinder liner deposits and describes their effect on lubricating oil consumption and surface topography. Cylinder liner deposits may be invisible to the naked eye, but can be identifed by suface topography measurement. A simulation of a cylinder liner with deposits is used to identih which of the available surface characteristics is best suited as a measure of deposit severity. Suface measurements are used to detect deposits in a case study. The deposits are found to be concentrated in a belt around the mid-stroke region of the cylinder liner. The comparatively low position of the dqosit may explain the slow response of afuel additive treatment in restoring oil consumption control, as theadditive treatment in this case is seen to be most effective in the uppermost part of the cylinder liner.

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