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Oil can make more of a mess and does not work with a lot of pumps (will burn the pump out after a short time).
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But if it leaks, mineral oil will not harm electronics. In fact, there have been demos of PCs with the motherboard completely submerged in mineral oil. It's quite safe, too - in fact, baby oil is just mineral oil plus some scents.
In contrast, a mixture of water, monoethylene glycol, and anticorrosion additives (used to cool those old Ashanti workstations) is extremely poisonous. Just 30mL of monoethylene glycol is enough to kill a person. As a result, they had to solder all connections and pressure test the whole assembly to make sure the system doesn't leak. And in the rare event it does leak, cleanup has to be done with great care. I actually had to repair an Ashanti workstation in which a pipe snapped (don't know how it did). I remember having to put on gloves and goggles, then rinsing it off with water to dilute the monoethlyene glycol, carefully drying it, getting the leak fixed, then refilling and checking for leaks. It wasn't very fun! (And it does damage electronics - some of the PCI slots in the machine never worked afterwards. The system tested stable and they did not need all the PCI slots, so I did not bother trying to completely fix it.)