He might be able to solve the problem for you.
Outdoor oil tank freezing.
In the photo shown here the oil lines are taken off of the top of the oil tank so as to avoid picking up water that may be present in the tank avoiding the icing problem.
The following steps are presented in order of least expense and or level of difficulty to perform or operate down.
The problem starts when the outside temperature drops below 20 degrees fahrenheit.
Suffice it to say the colder it gets outside and the longer your oil sits in that cold the more likely the heating oil in your tank and line will gel.
Heating oil freezing is also a term used when talking about the gelling of wax platelets.
Install the oil filter indoors.
Oil doesn t freeze in the same sense that water does.
How does heating oil freeze.
Explain the problem to your oil dealer.
When the temperature outdoors drops to freezing 32f or 0 c the heating oil in your tank starts to thicken.
Outdoor oil tanks in cold climates risk loss of heat from freezing water or jelling fuel as we just cited.
Paraffin an essential component of heating oil starts to crystallize and separate from the oil.