Oil is not an appropriate lubricant for alloy frame pistols. You should use grease on the rails (grease works better than oil on steel frame guns too but it's especially important to use it on alloy frames, which are more susceptible to wear). There is a reason why Sig ships their guns with a small packet of grease. G96 is more of a cleaner than a lubricant. It's a solvent that has low lubricity and leaks out easily. Try lubing your Sig with G96, racking the slide a few times, and then doing the same thing with grease. You will immediately notice a major difference in smoothness. Slide moving more smoothly = less friction, and therefore less wear.
