To reduce roll wear and chatter vibrations in its hot strip mill, Eko Stahl carried out roll gap lubrication trials. The trial equipment, the lubricant and the trials themselves are described. Rolling force and consequently electric energy consumption were reduced by 8 to 34 % . The automation system reacted without difficulties to sudden rolling force changes. Three types of torque changes due to roll gap lubrication have been observed. Chatter vibrations have been suppressed efficiently during lubrication. Roll wear decreased. Strip thickness and profile tolerances were affected positively, other quality parameters did not change significantly.