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Blue smoke = burning oil. Which means oil is getting into the combustion chamber, which is why you are fouling that #6 plug.
To see if it's the rings do a compression check. If #6 is not lower than the other cylinders, it's just the valve stem seals. If it's got low compression, it's the rings. But it would be odd to just have one cylinder with bad rings. Valve stem seals are known to wear on the top end of these motors. I did mine at 122K when I did the head gasket replacement, just to be safe.
Additives really won't do much to help your cause and are generally a waste of $$. Either fix the problem by doing the diagnosis above, or sell the car as stated. Good luck!!
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