A quick observation today made me wonder, about the passenger side sway bar bushing. The air conditioning unit drops condensation right onto that bushing, I wonder if this accelerates the deterioration of that particular bushing?

 

I didn't notice any real difference when I changed the bushings out on either the '06 or the '07, they were pretty much equally shot on both sides. But there may be something to your theory, anything is possible.

 

I'm thinkin it might be water proof. I changed them to polly, hope it helps.