After my spare was stolen I went without for three years. Almost to the day, I got a flat right in front of Discount Tire. Got the flat fixed and bought a new spare. No problems since!That's what I said until a few months ago.
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Fluids-wise, I carry several bottles of ATF+4, a couple bottles of a GL-5 gear lube, and a quart of engine oil. The ATF+4 has come in very handy over the 20 years I've been carrying it, only once for me, the others for trail situations. And usually a gallon of distilled water in case of a cooling system problem. I have needed and used them all on the trail over the years.