I would think that if they know (and I am sure they do) that these parts will be ruined by contact with gun oils that they would at the least mention it in their manual. b) That Benelli would produce a product that can be so easily damaged by commonly used products.
I am very surprised in that: a) Such a small amount of oil would cause this problem. This is apparently what has caused the problem.
Since my first posting I pulled the recoil pad and noticed some oil had drained down through the stock to the recoil pad and the comb pad. Ask the Benelli rep when you have them on the phone. I'm almost positive you have to push it from the butt toward the receiver. You have to push the comb pad forward or rearwards (can't remember which way). Regarding the removal of the comb, I can't remember exactly but it sits on little tracks built into the stock (top part). I called Benelli and they sent me a new one right away. I'm not real sure what happened or what caused this. Also, if you're cleaning the recoil tube like Benelli tells you, then some of the solvent will leak out of the tube and into the inside of the stock and then will eventually ooze out of the cracks. However, if you've cleaned it and allowed cleaning solvent and/or oil to get into the cracks on the CT stock it will do what you are describing. Have you cleaned the gun? If so, what can of solvent/cleaner did you use? I don't know of anything that would cause this straight out of the box.