Thank you for the response even if it did come off as, pardon the pun, abrasive.
After some research I discovered that copper and aluminum have adverse reactions to each other with the cooling liquid working as a catalyst. This could account for the odd buildup that I don't normally see when working with copper pipes and plain old tap water. It sounds like a design flaw to me with no easy way for a consumer to prevent the damage themselves especially if they don't know any better.
No. I don't expect things to last forever. Thats not how the universe works. What I do expect is if engineers were aware of this why didn't the radiator come with warnings and an easier way to change out the coolant. Better yet, why not a sensor which would detect any restricted flow and send a warning to the software to avoid any potentially damaging temperature spikes it may cause.
Sorry but simply throwing it out and buying a new one is not sustainable to my wallet nor the environment.
P.S. Inhibitors are unneeded in modern custom loops made of only plastics, brass, nickle, and copper. Distilled works just fine with very little corrosion. Most inhibitors themselves can break down, reduce heat transfer efficiency, and actually increase corrosion when past their normal shelf life which is way below the 5 year warranty.