No worries, yes they can corrode through although I haven't yet seen one do it. I guess he has checked the hoses and fittings? I would get a second hand one if new is $$$$$, as they aren't usually a big prob. Also, if he has already had these corrosion issues so far, I would recommend fitting a new oil cooler BEFORE it gets eaten through and fills the cooling system with engine oil. Check George130's threads on this drama - NOT something you want to experience!!!

JC