If you feel the springs need lube you must have torsion springs.That's the only kind that rubs on itself.I have oiled mine before,but I really doubt that is the reason your door is gaining weight.If it is the springs,they do lose their pooch over time.You can take up on them a half turn or so,and see if that makes a difference.If you don't know how to do that,please don't.If you don't understand how it's done,don't fool with it.If you think a Model A spring can be bad,look around and see what a torsion spring can do if the bar slips out of your hand.The rollers get stiff,the bearings in them get bad and drag,there are a hundred points of friction in an overhead door and they all add up.