The success of oil splash lubrication is intensely dependent on the speed of the gears. A standard guideline is a tangential speed of not less than 3 m/s is necessary in order for splash lubrication to become helpful. of lubricant is very important, and this is particularly vital with grease. https://milofovzc.blogoxo.com/34312759/gearbox-oil-treatment-for-dummies