The residue left Feser is deposited in the radiators and in all of the blocks and the circuit, the best is the distilled water to have the watercooling like the first day and for have a good temperature take a good material, blocks, etc...

Well... I'm using Fezer, and I thank my lord that I do.
I was emptying my loop a couple of months ago, and for those of you who havn't seen my rig, I can reveal that it is a PAIN to drain! Took it all apart, and put it back together later on.
What I hadn't seen, was that it had leaked quite an amount: 0,5 dl I would guess, straight into the mobo on the cpu and it's surroundings.
I fired it up, and there was no problem. I had to check a couple of things with the psu, and that's when I noticed. I took it apart again, let it dry, and put it back together. No problems what so ever.
It had run 3-4 hours while cpu was soaked in this fluid!!!

It may be freak luck, I dunno. But I'm glad, that's for sure!

Phew, what a lot of hot air... I am new here and although this was quite a time ago has anyone tried actually using car antifreeze neat or diluted? I may have missed the comment, and/or test, but as the test shows, ['MCT5 and MCT40. Both products come in a motor oil-esque packaging. The resemblance shouldn't be too surprising because Midwest Cooling Technologies also has its hand in automotive and industrial cooling applications. No wonder the stuff smells like antifreeze'], are they just bottling car antifreeze, (even more diluted maybe), and selling it to as gullible worry freaks???