I had the same problem. The dealer ship said I had damaged fin in the radiator that was causing my leak. They wanted 800+ to replace. He said I would be fine as long as I keep adding coolant. I went to Walmart and bought a cheap bottle of radiator leak stop ( around 7-10 dollars if I remember correctly). I did not get the kind with the large pellets. If you interested in trying it I will find out the exact product for you. Since I used it, my coolant level has not changed. Not a cure all but I haven't had a issue (knock on wood) in I over a year thankfully.
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