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Tebo, I don't know if Massimo needs a special coolant, but I use regular green colored coolant. To prevent losing coolant while it idles, I stick a small funnel in the rad (after sanding off the funnel seam) and keep it about 1/4 full of coolant. This way, I don't lose coolant while the coolant expands and shrinks during idle, and it makes it easier to see the air bubbles come out.