I just found deal on a used 35 mm F/2 AF-D. The lens is in perfect condition cosmetically and optically but the owner says it had the oily blades problem a couple of months ago. He had the lens repaired and no problems since. What I wonder is what's possibility of the problem repeating. If it repeats, is it expensive to fix it? Is there certain solution for this problem? I just want to know if this problem is certainly chronic. BTW buying a new one is out of the question right now.