said by JRW2:said by sailor:176.8 gallons @ $3.76 for $664.77 and then tax added another $16.62 for a total bill of $681.39 
My tank is in my basement, and I have the draw from it on the bottom, via gravity feed, my filter is sludgy every year too.

Where do you get that sludge treatment, I need it for mine too.
I've been told you can have the tank drained and cleaned, and this will reduce the sludge, but not eliminate it from coming back.

You could try COD delivery to reduce the price of oil, or try Slomin's for one year, I think they are offering it at $3.50 right now.
When I am in need of a bottle I will pick it up while in Riverhead at Blackmans. They are at 940 West Main Street, Riverhead 11901 ...