What do you use to winterize?

I have seen cars that set outside for 10 20 30 years on their tires some of them went flat some of them held air for all those years. The suspension did not blow out any of the bushings on those vehicles.
So what is the deal? Are these newfangled bushings blowing out from your vehicle just sitting around for a while? If so I think I'd go back to the original rubber ones.