Something new I learn about diesel.
I know that water condensation in some weather might occur, although in 30 years driving diesels in California I yet have to see a drop of water in fuel, but paraffin?
I drove on 7 years old diesel just fine.
Funny part about winter blend. Couple years ago I ended up on bussines in No Dakota with -30F temperatures. Just getting from warm cabin to the cashier at gas station was a problem, yet no station would have winter diesel blend.
Suppose summer blend is good down to -10 overnight, or -20 on driven vehicle.