Linseed oil goes hard by oxidising. Overdoing the oiling means that the oil deep in the stock doesn't get any oxygen, and stays liquid. It seems when. It gets warm because it expands.
Just keep wiping it. As stated above, wipe it off but use acetone rather than petrol. It will cease weeping eventually, unless it is a Catholic relic miracle stock, in which case, I'm out of ideas!
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