Diesel fuel additive ?
 

I have an outside 275 oil tank in a shed attached to the house.
I burn #2 oil in my furnace.

As the tank is exposed to outside temperature,s I treat the oil with 'Power Service Diesel Fuel Supplement' to prevent gelling. I swear by this stuff.

Last time I had an oil delivery I added the appropriate am amount the diesel supplement to the amount of oil pumped into tank.

Question.... since temps this w/e could drop below zero, could I add more diesel additive as a safety caution. Obviously, the best way to add is before an oil delivery, so not so sure if adding more at this time would actually help ?

Can you over-add diesel fuel supplement to a tank ?

Thanks.

Outside Fuel Tank
 

You did not say what brand of conditioner you use. Another problem with an outside tank is the moisture that lays on the bottom of the tank. I use off-road diesel in my tank to heat my shop, and add "Howes" fuel conditioner.
I try to shut the burner down for 8-12hrs after a delivery so that the sediment and water lays down. I have my pick-up at 4inches above the bottom of the tank.
To answer your ???. Yes you can add more conditioner, but to exceed 125% is a waste of conditioner, and not going to make a difference.
Peace My Friend, Moxie

You can add more Power Service (PS). We burn off road fuel in our Tucker Snowcats that sit outside and add more PS than prescribed.

Thanks Moxie and VitaBene for you feedback, much appreciated !

Bigdog