Whenever my oil company delivers and fills the tank, the gauge only goes up to between 3/4 and 7/8ths. I am told by the oil company that this is due to sludge build up in the oil tank. It's a 275 gallon tank. Is that amount of sludge normal or should I be concerned? Has anyone had any luck with the quart size jugs of fuel oil sludge remover that you pour into your tank? I'm wondering if it might cause more harm than good.
Let me know.