I was ordering inner tubes the other day, and got to talking to one of the mechanics about how to preserve these tubes. He said they soak the inner tubes for a day in a big container of peanut oil before inserting them into the tires. The valve stem cores are removed, so that the oil can get inside and coat the inside walls. He said the oil keeps them from dry rotting in the tire and helps to keep them from splitting from the heat. I asked if used motor oil can be used as an alternative, but he said the motor oil has a tendency to be too thick, so they use the peanut oil as it is much thinner, and coats more easily.
Has anybody else ever heard of this, or better yet, has tried this? I'm curious to hear the results if this method was used or if it actually works. I know for a fact that tubes dry out after a couple of years, and some split from constant air pressure changes, so if this works, and it means getting a few more years out them, I'm willing to give it a try.