This is Kodiaks Special Synthetic Lubricant Oil designed for Kodiaks innovative Pro-Lube Oil Bath System, allowing otherwise greased trailer bearings to transform to oil bath. This 8 oz. bottle will accomplish roughly 4 total fills (based off average 2 ounces per fill), which is essentially two years or use. This is ideally a refill bottle to be used in direct conjunction with Kodiaks Pro Lube system in either capacity offered. This Pro Lube Oil is specifically designed to reduce friction created during the towing process, which yields better performance both at low and high temperatures, resulting in improved bearing turnover. Oil Bath Systems in general are watertight due to the tight seals used in the system, are ideal for corrosion resistance.