Abstract Wear life of bonded molybdenum disulfide film lubricant applied on discrete sections of chromium electroplated to an aluminum alloy substrate under extreme contact pressure was investigated. Block-on-ring tests with ridge-shaped, hardened stainless steel blocks and lubricant coated rings were carried out in a nitrogen atmosphere for several kinds of ring materials including this under-coating. All tests except those for the discontinuous chromium under-coating indicated large or unstable friction soon after the tests started. Discontinuous chromium coating demonstrated a stable friction coefficient of around 0.05 for a long time and the lubricant film remained intact after the test. This is because discontinuous chromium coating on aluminum substrate deformed along the shape of the ridged-block and contact pressure was decreased to several hundred MPa.