Hi, I have a two old bottles of Auto-RX from about 6-7 years ago. They been sitting in my garage, unopened. ( I live in Texas, so it "gits" hot). I want to go ahead and use them in a old 87 Dodge with a 318 in it and (guessing) about 150,000 miles on it.

Does anyone know if the stuff "goes bad" or breaks down?

My understanding is that it works pretty well.