Welcome to DT Cougar. Power Service 911 is an emergency recovery system disigned to be used when you have water trouble or a gelled situation. It should not be used on a weekly basis and can cause damage to many of the fuel system components if used on a regular basis.
Mustang, running your diesel in the winter, even in -20 degree days will be no issue. With the new systems of injection and also with good glow plugs, your tractor will start up strong in the cold months. What I would suggest is that you use a GOOD additive in your fuel to help keep it fresh and not collecting water. Water will form ice and that can clog filters or plug fuel lines. Just because an additive is avaialble everywhere does not mean its a good one. Power Service is a great example as it is everywhere but it does next to nothing to your fuel.
There are two types of additives. Emmulsifiers that suspend water and de-emulsifiers that make water drop out of the system. I like to use an emmulsifier as it works best in our tractors as there are too many places to catch and store water perminantly. You can read more here (post 8 gets to the real info) : http://www.greentractortalk.com/forums/showthread.php?631-Fuel-Filter-change&highlight=soyshield
Once you add a good additive, don't worry about your fuel. When you start your tractor, activate your glow plugs and once it starts, allow it to warm up for a few minutes. Diesel oil is much thicker than a normal gasoline oil. They say a typical gasilione engine has oil throughout the engine in 20 seconds and a typical diesel engine will take up to 60 seconds to have oil everywhere. (exact times vary on the engines, but its a good example) After that, enjoy it.