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There is no where that the stud holes would come into contact with oil in the pan to wick up. Now if someone dumped a lot of oil in the adjacent cylinder and there was a bad gasket in that area, then oil could get pushed up when the engine is cranked over and wick up. Same with getting oil in the water, bad gasket and lots of oil in the cylinder from someone putting it in. But if oil can get in the water then water would be getting in the oil. It works both ways. Also if it was a case of lots of oil in the cylinders then it would be getting pushed into the manifolds too.