For use where oils of SAE 30 and 40 rating, or engine oils were originally recommended. Suitable for older gear boxes of straight cut or synchromesh design and for overdrives (such as Laycock). Gear Oil does not contain EP additives (which can cause serious damage to gearboxes containing yellow metals), or friction modifiers (which can cause slipping in overdrives and pre-selector gearboxes). Meets requirements of GL3.