Silicone oil is soluble in liquid propane. Both are non polar compounds. The solubility of silicone oil in liquid propane is the reason my grenades need such frequent lubrication. The flash evaporation of propane is a very effective degreaser which strips out the oil. My grenades can go longer between oiling when running HFC134a, which is polar. The rapid evaporation still strips out oil, but not as effectively as propane which solvates it before aerosolizing it.
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