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Friction wear of steel bearing balls in a non-conformal sliding contact, lubricated with base oils of various viscosities was studied. Sixteen mineral oils (lube oil bases), synthetic hydrocarbon oils (poly-alpha-olefins), synthetic non-hydrocarbon oils (polyol esters, polyglycols) and highly refined mineral white oils (kinematic viscosities at 100 deg C in the range 30.8 mm2/s to 31.4 mm2/s were used in the study. The antiwear properties of the oils, both mineral and synthetic ones, were improved with increasing their viscosity. To avoid the effect of the oil viscosity, the results obtained for the oils of similar viscosity in the range 3.8 mm2/s to 5.5 mm2/s were grouped and compared. The white oil and poly-alpha-olefins showed the best antiwear properties, while the polyol esters showed a very weak antiwear effect.