Syngear-GL are heavy-duty, GL-2 through GL-5 pure synthetic gear lubricants. They can be used in any truck differential or transmission where GL-2 through 5, Mack GO-J and GO-J Plus is specified. They have the advantage of very long drain intervals under severe ambient conditions. They are fuel-efficient under all conditions, especially at very low temperatures. These gear oils can also be used in a wide variety of off-highway and industrial applications where standard mineral-based fluids are not satisfactory.