I got an electric Remington chainsaw at a garage sale, and it works great. There is a plastic reservoir for bar oil that has two little holes for allowing the oil to come out and lubricate the chain. However, those seem to usually be clogged, and sometimes no oil flows out. Tell me about chain lubrication. Is it meant to affect the cutting, or preserve the chain? How do most chainsaws handle it? If I were to just apply the oil directly now and then, how much should I use? Thanks!