I have heard that there is some sort of an oily liquid mixed in with propane in small amounts. I forget the name of it though. I am not sure if it is an intentional additive like a lubricant, or an unintentional byproduct. What I have heard is that in systems where there is high volume usage it can accumulate at low points in the plumbing and eventually impede the flow. I would assume that makers of propane vehicles and commercial equipment have this all figured out, but various forms of retrofit kits might not be so well designed.
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