The experimental check described proved that viscosity measurements on polymer modified oils with rotational and capillary viscometers can be successfully correlated. The rules for this are the same as those used for other non-Newtonian liquids (solutions of high polymers); namely, viscosity vs. the rate of shear at the wall, R. This is valid to at least 106sec−1.Contributed by the ASLE Technical Committee on Lubrication Fundamentals, and presented at the Annual Meeting of the American Society of Lubrication Engineers held in Detroit, Michigan, April. 1957.