Replaced oem radiator 13months ago because the small 1/4"overflow stud was leaking.I tried repairing it to no avail,so i replaced it with a new one.Now 13 months later it is leaking in the same place.The company i got it from is giving me a new one.When i bought the first one i did know about this site.I have recently read on this site that the upper hose neck was a problem but never this overflow stud. Is this a common problem and if so what can i do to prevent this from happing again?