So, at what temperature will i have problems if i shut it off?

I've yet to come up with a hard and fast temperature at which ULSD gels, but it is higher than with the old fuel of years ago. I know that power service is not as effective as the bottle claims. Last January I blended with power service to the recomended dose and let my truck sit in the driveway for a few days in -20 below temps and both tanks and filters gelled. I believe that the most effective blend is 50/50 number 1 and 2.

If you're not asking asking about gelling but rather just how cold can you go and have enough battery power, I'd say roughly 20 degrees and lower you are asking for trouble assuming you dont have a block heater and have 4 batteries instead of 3.

You were kind broad, hope this helped ya a little.

 

I don't use additives for winter weather. I fill with the 1 & 2 blend and have not had a problem. I agree with the 20 degree mark as to where you might start having starting problems.

 

Off topic, but just in case you never heard this. Don't lock your trailer brakes in the above kind of temps. They can freeze and you could end up like a CRST driver I saw once, going down the interstate about 45 mph with his trailer tires drug down to the rims on one side.

 

I don't think that's just limited to the 'crusty' drivers...

 

I saw a pumpkin truck doing the same thing the other day....smelled the breaks from a mile away. Everyone was calling him on the CB but of course he woudn't acknowledge. By the time he finally decided to pull over you couldn't even see his truck anymore because of the smoke

 

Been shutting ours off this winter so far so good. 0 Deg is the lowest i can recall shutting the truck off in. I have been using Power Service as of late i always add to fuel when fuel before we get into very cold temps and then treat as fuel is replenished. We have 4 pretty much new interstate batteries in the box. I haven't had any problems with brakes freezing yet but i always be careful when taking off to make sure there aren't any dragging. We have also used Howes without any issues.

 

Had a fuel filter freeze up once.
I filled the tanks at a truckstop in IL then went in the sleeper overnight with the truck idling. Got up the next morning and drove maybe 50 or a 100 miles and the truck lost power and shut down. When I called the companies shop to get help sent, I asked the shop foreman why they didn't throw a couple of filters in the side box. He told me most drivers didn't know how to change a fuel filter.
It was winter and cold, but not all that cold.

 

there are heated filters on market. Volvo sells here trucks with filter heaters. good thing!

 

I have don't worry about fuel additives unless it gets below zero. I plug my truck in at home when it gets below zero also.