The usefulness of oil splash lubrication is greatly dependent on the velocity on the gears. A common guideline is usually that a tangential velocity of a minimum of three m/s is required to ensure that splash lubrication to become helpful. of lubricant is vital, which is very vital with grease. https://mylespbjrw.ageeksblog.com/33025419/a-review-of-gearbox-oil-treatment