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Hard to predict, but I can use it for parts if it does break down so keep my MR name.
 
UPDATE: So my buddy who gave me this machine said this G5 already leaked and Apple sent someone out to fix it once already. Is it eventually going to crap out agin?

Maybe if it does, you could be one of the lucky ones to get it replaced with a new Mac Pro. A few on this site has already had that happened to them.
 
UPDATE: So my buddy who gave me this machine said this G5 already leaked and Apple sent someone out to fix it once already. Is it eventually going to crap out again?

Everything will fail eventually; the question is when.

If a leaky LCS system is your worry, then you might invest in silicone oil to replace Apple's coolant. Non-conductive; if there's a leak, one just fixes the leak and wipes off whatever parts were affected.
 
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