No you can pour the kerosene in the oil fill.I would pour 3 qts of kerosene in and 2 qts of cheap oil and crank the engine. Just have to let it idle for about 5-10 minutes. Drain it and do it again till the sludge went away. These were last ditch efforts for a cure. If you ever saw the product they use to sell called engine flush/cleaner, it was basically kerosene, they would instruct you to crank the engine and let it idle to get thru out the engine.
