I had one in use for a few years.. when I took it off, all the anodizing was gone from the inside and it was pretty bad. at the time I had been running Royal purple Ice and water. The block probably would have been fine if I had used a stronger mix, or AF instead like I do now, and changed the coolant/checked PH at some interval. Now adays I change hardware so often that the coolant is never in use for more than a few months rather than years. I have another 5000 block and will probably use it in my next pc.
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