I agree that additives like Power Service are cheap insurance. On the other hand, in over 30 years of daily diesel use without additives, including Michigan winters, I never had a fuel problem until last year when the temps were minus 24 below. Twice I experienced fuel gelling. Acted just like a dirty fuel filter. Truck would run but had no power and would struggle to go 25 mph. Luckily I keep a can of Diesel 911 on board. Added that and 5 minutes later all was well. I still don't use additives as a regular practice, but I will always have 911 on hand in the winter. Just in case. Good luck.