I wouldn't worry about it, just make sure to use new style antifreeze and if it is full strength cut it with distilled water instead of tap water. I had a jeep Cherokee, used the old regular glycol green antifreeze in it, after a year the system turned to a sludge from electrolysis. I flushed it and started using the orange Mopar antifreeze and it cured the problem. I also found the same problem in a couple of corvettes a had with aluminum radiator's. New style antifreeze and distilled water was the cure.
