NISOTEC LOK SAE 40 is zinc-free heavy-duty diesel motor oil, designed to meet the severe service demands imposed by newer railroad locomotive. This zink-free formulation provides the protection of silver bearings and chlorine free to reduce environmental and disposal impact. The balanced detergent, dispersant and antiwear system allows this 12 TBN oil to provide superior soot, sludge, viscosity, and wear control resulting in improved engine cleanliness, lower wear and particulate emissions.