A high flash point solvent is something like Varsol which is a trade name for mineral spirits. The reason they recommend a high flash point solvent is so you won't blow yourself up. Gasoline works better . . . but I wouldn't recommend you smoke while doing it. An easy way to get the oil evenly in the filter is to pour some 10w40 oil in some clean solvent and soak the filter, remove it and let the solvent evaporate.
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