The Chevrolet oil filter is the part most often changed over the lifetime of your vehicle. This should occur every 3,000 to 5,000 miles the car travels down the road. The oil filter on your Chevrolet is part of the lubrication system of your engine. Its only purpose is to remove contaminants from the engine oil. The reason it should be changed every 3,000 to 5,000 miles is that is the limit the filter element has been tested to properly remove enough contaminants to keep the oil clean. Beyond this point, the contamination will not be filtered out in sufficient amounts because the filter element is becoming filled. At that point the bypass valve will open in the oil filter on your Chevrolet and no filtration of the oil will occur. Most of the contamination that a Chevrolet oil filter will be removing from the oil is carbon. This is the byproduct of the combustion of the fuel. These particles are very small and will reach into every surface of the engine, including the bearings and cause excessive wear if not properly removed. It is true that used oil can be recycled and used for many different purposes but the oil filter on your Chevrolet has to be replaced. It cannot be cleaned and reused for anything other than space in the trash can. If the oil filter has a drip on the bottom of it when it is in place on the engine the polymer seal on the filter should be checked. This is the seal to which the filter is in contact with the engine block and must be tight or oil will leak out. The higher the engine is turning, the greater the pressure of the oil and amount of oil that will be lost thru this area if the seal is not correctly made.