Jamb nuts are known to leak...doesn't have to be manufacture specific but aeromotive is known for having good quality parts that don't leak so it is kind of strange. Worst case scenario you could always put some liquid plumbers tape on it, and that'll stop the leaking.
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O4 PT Cruiser non GT
Stock b****es, come get me 
Sporting new Nikon D40 w/18-55 & 55-200...it's a learning curve that's for sure!
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