My first impression would be that the coolant is somewhat caustic and this is causing the leak at the end caps, however, if the problem is not happening to others, I'm guessing that there is perhaps 'electrolysis' occuring. I have heard that corrosion in the heat cores can also occur as a result of the coolant flowing through the core faster than normal. I believe you can get a 'restrictor' to slow the speed of the coolant through the heater core.
Hope this helps.
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