The reason that viscous fans usually fail is that the seal on the front or rear fails. While adding fluid will help it is only short term.
Have any of you seen what happens when the fan loses a or several blades? Blades can and do go through at various times the bonnet( I have seen this) , the battery ( I have also seen this ,same car). the radiator , the shroud etc etc.
So if you plan to lock up a viscous be aware that you may get home much later if the blades take out the battery and /or the radiator.
IMHO VCs are very reliable and only fail after telling you for many months.
A quick check by pulling it off and checking for front or rear staining from a failed seal can save a lot of drama later.
Regards Philip A



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