One should never compare a pc circuit to that of an automobile cooling system! Two entirely different environments altogether. Glycol based coolants mixed with distilled water are required where the environment can go well below the freezing point of water and the other way, above the boiling point.
Your PC coolant rarely if ever will reach 40C let alone 110C! Ditto for the low temperatures unless you are running a sub ambient chiller. Only then should an actual anti freeze be considered.
Adding anything to distilled is completely un-necessary. Dyes will stain your tubing, reservoirs and all wetted parts. Mayhem's dye is nothing more than Rit dye found in a grocery store added to distilled water and marked up considerably. It will also foul tiny galleries in some blocks as well.
If you want decor, I suggest colored tubing and colored opaque acetal tops.
Ideally, you should keep your coolant as dark as possible and use strips of the purest silver possible in an area that gets laminar flow.
The bearings in most pumps (Laing D5, for example) are "lubricated" with water. No additives are required. Increasing the specific gravity above 1 just increases the pump's lifting load resulting in lower flows.
The crux of the matter is to keep it simple, use distilled water and silver strips and you will be happy.
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