Classic D140 is a high viscosity straight gear oil formulated with high quality mineral oils. It contains anti-oxidation and anti-wear additives to protect the gear teeth against wear in gearboxes and axles. Suitable for most types of gears including helical, spur, bevel and worm, but not to be used for hypoid gears. Designed for use with sensitive (yellow) metal components such as brass or bronze, and in older vehicles where wear may have occurred.