The recent issue of Road and Track magazine reiterates that tires that are more than 5 years old should be replaced. They say that the rubber dries out, even if stored in a plastic wrap, and that the tires lose their original grip. They quote test results.
I believe what they say, but I am now concerned about the tires on my classic car. About 7 yrs ago I bought up the last ones which were available in the US at that time as spares. The ones on my car are just as old. So are the tubes which I bought for the tires.
Are there any approved protection techniques for tires? Or can the essential oils be replaced with a swab of some kind? Why shouldn't storage in plastic help? After all, the vapor pressure should build up inside the wrap and help retain the volitles in the tire.