I bought my '85 B8200 in '98. It was faded from sitting outside but clean. I had to replace the tires from weather crack a couple years later. I started storing it a shed to keep the sun and weather off. I looked pretty much same as when I got it, when I sold it three years ago. A few more scratches, but I think keeping it out of the weather saves the tires and hoses.
Have kept the current tractor in the shed too, as did previous owner. It is 11 year old, and looks good, although has some scratches.