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These liquids are typically what our team finds in the container when it arrives at our testing facilities. Without a strong solvent such as xylene, the heavier-end paraffin that blinds the filter will not go back into solution. In the absence of higher temperatures, diesel fuel itself doesn’t have enough solvency power to dissolve the wax on the filter. Heavy, waxy fuels have more of these higher-chain hydrocarbons, which is why our region has been seeing more of this “white grease” that doesn’t melt at room temperatures. Under these circumstances, it is not biodiesel related, just long-chain ULSD hydrocarbons—something that your regional suppliers can’t control.