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Pure silicone oil (like RC shock oil) won't cause rubber/silicone to bloat no matter what weight; if that happened, there was something else in the oil, or it wasn't silicone oil.
You also mentioned Crossman Pellet Gun oil or something at some point (your typing makes my head hurt so I'm not inclined to go back to check); that stuff will also cause bloating, its meant to help fix small leaks on heavy duty o-rings (the kind used in CO2 guns).
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