Not exactly the same as the oil problem but a fellow shooter had a RL that he shot at skeet. He began having problems with the rib moving forward, at times leaving a gap of a quarter inch between the "rib ramp" on the monoblock and the rib itself - something that can occur only on a RL (as far as I know) since the rib floats on a series of supports down the barrel.
He tried several means to secure the rib from floating forward during shooting and finally discovered that the barrel was slowly separating from the monoblock where it was joined. If I had not actually seen this occur, I would have sworn that this was an "urban myth". He returned it to Ruger and they did repair (not replace) the barrel but it took about 6 months. Not sure if the oil has any bearing on this unusual failure but just thought that I would offer up the experience. And yes, I do own a RL and enjoy shooting it - but I am a little wary of the rib/barrel joint.
Z
