Do you need to replace or change your engine oil filter? Let us show you how with some Repco Know How. The role of an oil Filter is to protect your engine's lubrication system from dirt, grit, gunk and debris that can clog and starve your engine's components from being well lubricated and in some cases causing scouring your cylinder walls, big end bearings, cam lobes and valves that can result in a smoky engine or even worse, catastrophic failure requiring a replacement engine. by replacing your oil filter you can ensure that you're getting the optimal amount of clean oil through your engine allowing it to run efficient and clean, saving you money in costly repairs.