There are several ways to approach fuel additives.

The smartest thing you can do is get your diesel from a truck stop because they go through thousands of gallons of fuel each week so your getting fresh fuel. And they already put the additives in the underground tank so you don't have to mess with it. If your not sure if it is blended fuel ask the attendant. The method that I prefer is to use a 50/50 mix of #1 and#2 diesel fuel. This is good for about -30 deg. f . If your running in arctic conditions you can run straight#1 or keroseen. I would not even consider using any additives or blended fuels unless it is -0 deg f. One advantage that additives have is that you won't loose any fuel ecconomy. When you use #1 or keroseen it has less BTU's that #2.

REMEMBER if your fuel gels you just can't add additive and it will melt gelled fuel it has to be added before it gels

I have only seen OTR trucks gel a couple of times in the past fifteen years. And remeber the fuel tanks on a truck are hanging in the breeze where most MB that i'm aware of are in the cabin out of the wind.

When I am at work tommorrow I will try to get exact temps. when fuel gels

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87' 300sdl