I cleaned an XR9-S the first time and I suspect I over-oiled. I followed the oil locations provided in the manual, and after letting the gun sit for a few days it has been weeping lots of oil from various spots. How much oil is supposed to be applied to each spot? I'm thinking next time I will get a syringe with oil to just dispense a tiny amount at each specified location, not an entire drop of oil.
Have had good luck with a pair of these simple Refillable Needle Oilers over a number of years with no leakage to date except one occasion when one of the plastic barrels cracked resulting in a minor spill of several drops.
As for the over-oiled question I had ever met. It was my uncle who solved this problem for me. But I have forgotten the steps. I will ask him for help with your this problem later.