CsTDI said:
just to color the picture in a little more, expecially for the OP, light duty diesels are not the same as heavy duty diesels. Also, there are definitely truckers that use additives and of course truck stops and heavy duty diesel truck and bus service stations stock fuel additives- some by the pallet load
Many truckers use a system that warms the fuel to keep it from gelling. Then they buy unwinterized fuel because it helps them get better fuel mileage and it costs less per gallon
So here's my advice. If you always buy at the same station(s), ask about their fuel. If they don't know, then ask for a phone number for their fuel supplier and ask THEM.
If they have regular diesel and premium diesel, the premium stuff will be the winterized stuff. 5-10 cents/gallon extra but definitely worth it.
If you are on the road and need to stop at an unfamiliar station, ask whether their fuel is winterized and to what temperature. If the answer is unsatisfactory, add a healthy dose of Diesel Kleen Power Service,
winter version. There may be better additives, but PS is the one that most every station and auto parts store will carry.
If it starts to get unseasonably cold, like 10°F in November or -10°F in December, consider adding a double or triple dose of PS, or getting a bottle of Diesel 911 for a really hard-core dose of anti-gel.
Spending $15 or $20 for additives unnecessarily is better than paying $80-$150 for a tow and then letting your TDI sit overnight in a warm garage.