The usefulness of oil splash lubrication is seriously depending on the speed of your gears. A standard guideline is always that a tangential speed of at least three m/s is required to ensure that splash lubrication for being effective. of lubricant is very important, which is very important with grease. https://gearbox-oil-treatment86418.theideasblog.com/34639758/what-does-gearbox-oil-treatment-mean